Ola Olén

Om mig
Publikationer
Forskningsbidrag
CV
Populärvetenskap och samverkan

Om mig

Ola Olén är överläkare vid Sachsska barn- och ungdomssjukhusets enhet
för pediatrisk gastroenterologi och nutrition. Han är också docent i epidemiologi vid
Karolinska Institutet och gruppledare samt adjungerad lektor vid Institutionen för medicin
Solna, Enheten för klinisk epidemiologi, Karolinska Institutet. *För
fullständig beskrivning, var god se den engelska versionen av denna sida.*

Artiklar

Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2024;22(4):858-866.e6

Quality of Life and Bidirectional Gut-Brain Interactions in Irritable Bowel Syndrome From Adolescence to Adulthood.

Sjölund J; Kull I; Bergström A; Ljótsson B; Törnblom H; Olén O; Simrén M
Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2024;22(4):831-846

Histologic Activity in Inflammatory Bowel Disease and Risk of Serious Infections: A Nationwide Study.

Mårild K; Söderling J; Axelrad J; Halfvarson J; Forss A; SWIBREG Study Group; Olén O; Ludvigsson JF
Article: JOURNAL OF CROHNS & COLITIS. 2024;:jjae041

Spondyloarthritis in first-degree relatives and spouses of patients with inflammatory bowel disease: A nationwide population-based cohort study from Sweden.

Shrestha S; Brand JS; Osooli M; Eriksson C; Schoultz I; Askling J; Jess T; Montgomery S; Olén O; Halfvarson J
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2024;59(9):1122-1133

Impact of inflammatory bowel disease on the risk of acute coronary syndrome: A Swedish Nationwide Cohort Study.

Eriksson C; Sun J; Bryder M; Bröms G; Everhov ÅH; Forss A; Jernberg T; Ludvigsson JF; Olén O
Article: JOURNAL OF CROHNS & COLITIS. 2024;:jjae029

The epidemiology of inflammatory bowel diseases during the COVID-19 pandemic: comparison of two nationwide cohorts.

Atia O; Bryder N; Mendelovici A; Ledderman N; Ben-Tov A; Osooli M; Forss A; Loewenberg Weisband Y; Matz E; Dotan I; Turner D; Olén O
Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2024;:S1542-3565(24)00201-5

Association Between Celiac Disease and Irritable Bowel Syndrome: A Nationwide Cohort Study.

Mårild K; Söderling J; Lebwohl B; Green PHR; Törnblom H; Simrén M; Staller K; Olén O; Ludvigsson JF
Article: GASTROENTEROLOGY. 2024;:S0016-5085(24)00055-6

Histologic Remission in Inflammatory Bowel Disease and Female Fertility: A Nationwide Study.

Mårild K; Söderling J; Stephansson O; Axelrad J; Halfvarson J; SWIBREG Study Group; Bröms G; Marsal J; Olén O; Ludvigsson JF
Article: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2024

Long-term risk of myocarditis in patients with inflammatory bowel disease: a nationwide cohort study in Sweden.

Sun J; Yao J; Olén O; Halfvarson J; Bergman D; Ebrahimi F; Roelstraete B; Rosengren A; Sundström J; Ludvigsson JF
Article: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2024;119(2):313-322

Atherosclerosis as a Risk Factor of Inflammatory Bowel Disease: A Population-Based Case-Control Study.

Faye AS; Axelrad JE; Sun J; Halfvarson J; Söderling J; Olén O; Ludvigsson JF
Article: UNITED EUROPEAN GASTROENTEROLOGY JOURNAL. 2024;12(1):34-43

Eosinophilic esophagitis is associated with increased risk of later inflammatory bowel disease in a nationwide Swedish population cohort.

Uchida AM; Garber JJ; Pyne A; Peterson K; Roelstraete B; Olén O; Halfvarson J; Ludvigsson JF
Article: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2024;59(2):176-182

Identification of diverticular disease in Swedish healthcare registers: a validation study.

Mahmood MW; Schmidt PT; Olén O; Hellsing C; Hjern F; Abraham-Nordling M
Article: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2024;119(1):138-146

Absolute and Relative Risks of Kidney and Urological Complications in Patients With Inflammatory Bowel Disease.

Yang Y; Ludvigsson JF; Olén O; Sjölander A; Carrero JJ
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2023;58(11-12):1175-1184

Antibiotic use as a risk factor for irritable bowel syndrome: Results from a nationwide, case-control study.

Staller K; Olén O; Söderling J; Roelstraete B; Törnblom H; Kuo B; Nguyen LH; Ludvigsson JF
Article: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2023;118(11):2041-2051

Microscopic Colitis and Risk of Incident Acute Pancreatitis: A Nationwide Population-Based Matched Cohort Study.

Bergman D; Roelstraete B; Olén O; Lindkvist B; Ludvigsson JF
Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2023;21(12):3132-3142

Increasing Risk of Lymphoma Over Time in Crohn's Disease but Not in Ulcerative Colitis: A Scandinavian Cohort Study.

Olén O; Smedby KE; Erichsen R; Pedersen L; Halfvarson J; Hallqvist-Everhov Å; Bryder N; SWIBREG Study Group; Askling J; Ekbom A; Sachs MC; Sørensen HT; Ludvigsson JF
Article: JOURNAL OF CROHNS & COLITIS. 2023;17(9):1395-1409

Inflammatory Bowel Disease and Risk of Colorectal Polyps: A Nationwide Population-Based Cohort Study From Sweden.

Axelrad JE; Olén O; Söderling J; Roelstraete B; Khalili H; Song M; Faye A; Eberhardson M; Halfvarson J; Ludvigsson JF
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2023;58(7):692-703

Increasing healthcare costs in inflammatory bowel disease 2007-2020 in Sweden.

Everhov ÅH; Söderling J; Befrits G; Khalili H; Bröms G; Neovius M; SWIBREG study group; Askling J; Halfvarson J; Ludvigsson JF; Olén O
Article: PLOS MEDICINE. 2023;20(10):e1004305

Long-term risk of arrhythmias in patients with inflammatory bowel disease: A population-based, sibling-controlled cohort study.

Sun J; Roelstraete B; Svennberg E; Halfvarson J; Sundström J; Forss A; Olén O; Ludvigsson JF
Article: ECLINICALMEDICINE. 2023;63:102182

Statin use and risk of colorectal cancer in patients with inflammatory bowel disease.

Sun J; Halfvarson J; Bergman D; Ebrahimi F; Roelstraete B; Lochhead P; Song M; Olén O; Ludvigsson JF
Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2023;21(10):2639-2648.e6

Incidence, Management, and Outcomes of Very Early Onset Inflammatory Bowel Diseases and Infantile-Onset Disease: An Epi-IIRN Study.

Atia O; Benchimol EI; Ledderman N; Greenfeld S; Kariv R; Weisband YL; Matz E; Ollech J; Dotan I; Assa A; Shouval DS; Uhlig HH; Muise AM; Olén O; Kuenzig ME; Kaplan GG; Turner D
Article: NEUROLOGY. 2023;101(6):e653-e664

Long-term Risk of Stroke in Patients With Inflammatory Bowel Disease: A Population-Based, Sibling-Controlled Cohort Study, 1969-2019.

Sun J; Halfvarson J; Appelros P; Bergman D; Ebrahimi F; Roelstraete B; Olén O; Ludvigsson JF
Journal article: SURGERY. 2023;174(2):144-151

Outcomes of bariatric surgery for patients with prevalent inflammatory bowel disease: A nationwide registry-based cohort study.

Wallhuss A; Ottosson J; Cao Y; Andersson E; Bergemalm D; Eriksson C; Olén O; Szabo E; Stenberg E
Article: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2023;58(7):709-717

Identification of irritable bowel syndrome in the Swedish National Patient Register: a validation study.

Tornkvist NT; Backman A-S; Linder M; Altman M; Simrén M; Olén O; Törnblom H
Article: JOURNAL OF PEDIATRIC GASTROENTEROLOGY AND NUTRITION. 2023;77(1):55-61

Risk Factors of Cancer in Pediatric-Onset Inflammatory Bowel Disease in Denmark and Finland.

Malham M; Jansson S; Malmborg P; Olén O; Paerregaard A; Virta LJ; Jakobsen C; Kolho K-L; Wewer V
Article: DIGESTIVE DISEASES AND SCIENCES. 2023;68(7):3119-3128

Ustekinumab Versus Anti-tumour Necrosis Factor Alpha Agents as Second-Line Biologics in Crohn's Disease.

Eriksson C; Söderling J; Karlqvist S; Bröms G; Everhov ÅH; Bergemalm D; Ludvigsson JF; SWIBREG study group; Olén O; Halfvarson J
Article: INTERNATIONAL JOURNAL OF CANCER. 2023;152(11):2303-2313

Association of inflammatory bowel disease in first-degree relatives with risk of colorectal cancer: A nationwide case-control study in Sweden.

Wang K; Olén O; Emilsson L; Khalili H; Halfvarson J; Song M; Ludvigsson JF
Article: UNITED EUROPEAN GASTROENTEROLOGY JOURNAL. 2023;11(5):471-481

Colectomy in patients with ulcerative colitis is not associated to future diagnosis of primary sclerosing cholangitis.

Lundberg Båve A; Olén O; Söderling J; SWIBREG study Group; Ludvigsson JF; Bergquist A; Nordenvall C
Article: JOURNAL OF CROHNS & COLITIS. 2023;17(5):746-753

Diet Quality and Risk of Older-onset Crohn's Disease and Ulcerative Colitis.

Khalili H; Hakansson N; Casey K; Lopes E; Ludvigsson JF; Chan AT; Chan SSM; Olen O; Wolk A
Article: INFLAMMATORY BOWEL DISEASES. 2023;29(3):339-348

The Risk of Serious Infections Before and After Anti-TNF Therapy in Inflammatory Bowel Disease: A Retrospective Cohort Study.

Holmgren J; Fröborg A; Visuri I; Halfvarson J; Hjortswang H; Karling P; Myrelid P; Olén O; SWIBREG study group; Ludvigsson JF; Grip O
Article: PLOS MEDICINE. 2023;20(2):e1004185

Long-term risk of inflammatory bowel disease after endoscopic biopsy with normal mucosa: A population-based, sibling-controlled cohort study in Sweden.

Sun J; Fang F; Olén O; Song M; Halfvarson J; Roelstraete B; Khalili H; Ludvigsson JF
Article: JNCI-JOURNAL OF THE NATIONAL CANCER INSTITUTE. 2023;115(1):62-70

Cancer risk in patients with diverticular disease: A nationwide cohort study.

Ma W; Walker MM; Thuresson M; Roelstraete B; Sköldberg F; Olén O; Strate LL; Chan AT; Ludvigsson JF
Article: INFLAMMATORY BOWEL DISEASES. 2023;:izac267

Estimated Glomerular Filtration Rate and the Risk of Inflammatory Bowel Disease in Adults: A Swedish Population-Based Study.

Yang Y; Ludvigsson JF; Olén O; Sjölander A; Carrero JJ
Article: DIGESTIVE DISEASES AND SCIENCES. 2023;68(1):65-76

Ustekinumab Is Associated with Real-World Long-Term Effectiveness and Improved Health-Related Quality of Life in Crohn's Disease.

Forss A; Clements M; Myrelid P; Strid H; Söderman C; Wagner A; Andersson D; Hjelm F; PROSE SWIBREG study group; Olén O; Halfvarson J; Ludvigsson JF
Article: GUT. 2022;:1093-1100

Lifestyle factors for the prevention of inflammatory bowel disease.

Lopes EW; Chan SSM; Song M; Ludvigsson JF; Håkansson N; Lochhead P; Clark A; Burke KE; Ananthakrishnan AN; Cross AJ; Palli D; Bergmann MM; Richter JM; Chan AT; Olén O; Wolk A; Khalili H; EPIC-IBD investigators
Article: ANNALS OF EPIDEMIOLOGY. 2022;76:39-49

Mortality risk increased in colonic diverticular disease: a nationwide cohort study.

Cameron R; Walker MM; Thuresson M; Roelstraete B; Sköldberg F; Olén O; Talley NJ; Ludvigsson JF
Article: JOURNAL OF CROHNS & COLITIS. 2022;16(10):1540-1550

Association Between Inflammatory Bowel Disease and Spondyloarthritis: Findings from a Nationwide Study in Sweden.

Shrestha S; Brand JS; Järås J; Schoultz I; Montgomery S; Askling J; Ludvigsson JF; Olen O; Halfvarson J; SWIBREG Study Group
Article: ECLINICALMEDICINE. 2022;53:101722

Histological remission in inflammatory bowel disease and risk of adverse pregnancy outcomes: A nationwide study.

Mårild K; Söderling J; Stephansson O; Axelrad J; Halfvarson J; SWIBREG Study Group; Bröms G; Marsal J; Olén O; Ludvigsson JF
Article: JOURNAL OF PEDIATRIC GASTROENTEROLOGY AND NUTRITION. 2022;75(4):480-484

Colorectal Cancer in Childhood-onset Inflammatory Bowel Disease: A Scandinavian Register-based Cohort Study, 1969-2017.

Everhov ÅH; Ludvigsson JF; Järås J; Erichsen R; Pedersen L; Halfvarson J; Askling J; Ekbom A; Sørensen HT; Olén O
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2022;56(7):1168-1182

Colorectal cancer in elderly-onset inflammatory bowel disease: a 1969-2017 Scandinavian register-based cohort study.

Everhov ÅH; Erichsen R; Järås J; Pedersen L; Halfvarson J; Askling J; Ekbom A; Ludvigsson JF; Sørensen HT; Olén O
Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2022;20(10):2358-2365.e11

Prevalence and Implications of Frailty in Older Adults With Incident Inflammatory Bowel Diseases: A Nationwide Cohort Study.

Kochar B; Jylhävä J; Söderling J; Ritchie CS; SWIBREG Study Group; Ludvigsson JF; Khalili H; Olén O
Article: ESOPHAGUS. 2022;19(4):542-553

Risk of fractures in individuals with eosinophilic esophagitis: nationwide population-based cohort study.

Garber JJ; Roelstraete B; Lochhead PJ; Uchida AM; Michaëlsson K; Olén O; Ludvigsson JF
Article: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2022;117(9):1471-1481

Association of Celiac Disease and Inflammatory Bowel Disease: A Nationwide Register-Based Cohort Study.

Mårild K; Söderling J; Lebwohl B; Green PHR; Pinto-Sanchez MI; Halfvarson J; Roelstraete B; Olén O; Ludvigsson JF
Article: UNITED EUROPEAN GASTROENTEROLOGY JOURNAL. 2022;10(7):631-639

Ustekinumab treatment in ulcerative colitis: Real-world data from the Swedish inflammatory bowel disease quality register.

Thunberg J; Björkqvist O; Hedin CRH; Forss A; Söderman C; Bergemalm D; SWIBREG Study Group; Olén O; Hjortswang H; Strid H; Ludvigsson JF; Eriksson C; Halfvarson J
Article: INFLAMMATORY BOWEL DISEASES. 2022;28(9):1301-1308

Primary Versus Staged Reconstruction and Risk of Surgical Failure in Patients With Ulcerative Colitis: a Nation-wide Cohort Study.

Westberg K; Olén O; Söderling J; Bengtsson J; Ludvigsson JF; Everhov ÅH; Myrelid P; Nordenvall C
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2022;56(6):1007-1017

Earnings during adulthood in patients with childhood-onset inflammatory bowel disease: a nationwide population-based cohort study.

Malmborg P; Everhov ÅH; Söderling J; Ludvigsson JF; Bruze G; Olén O
Article: BMC CANCER. 2022;22(1):890

Normal gastrointestinal mucosa at biopsy and subsequent cancer risk: nationwide population-based, sibling-controlled cohort study.

Sun J; Fang F; Olén O; Song M; Halfvarson J; Roelstraete B; Khalili H; Ludvigsson JF
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2022;56(3):491-500

Age determines the risk of familial inflammatory bowel disease-A nationwide study.

Halfvarson J; Ludvigsson JF; Bresso F; Askling J; Sachs MC; Olén O
Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2022;20(8):1867-1876.e2

Chronic Constipation as a Risk Factor for Colorectal Cancer: Results From a Nationwide, Case-Control Study.

Staller K; Olén O; Söderling J; Roelstraete B; Törnblom H; Song M; Ludvigsson JF
Article: INFLAMMATORY BOWEL DISEASES. 2022;28(8):1160-1168

Probability of Stoma in Incident Patients With Crohn's Disease in Sweden 2003-2019: A Population-based Study.

Everhov ÅH; Kalman TD; Söderling J; Nordenvall C; Halfvarson J; Ekbom A; Ludvigsson JF; Olén O; Myrelid P
Article: ACTA PAEDIATRICA. 2022;111(8):1621-1627

Validation of child-adapted short scales for measuring gastrointestinal-specific avoidance and anxiety.

Lalouni M; Olén O; Bjureberg J; Bonnert M; Chalder T; Hedman-Lagerlöf E; Reme SE; Serlachius E; Ljótsson B
Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2022;20(5):1048-1058

Obesity is Associated With Increased Risk of Crohn's disease, but not Ulcerative Colitis: A Pooled Analysis of Five Prospective Cohort Studies.

Chan SSM; Chen Y; Casey K; Olen O; Ludvigsson JF; Carbonnel F; Oldenburg B; Gunter MJ; Tjønneland A; Grip O; DEFINe-IBD Investigators; Lochhead P; Chan AT; Wolk A; Khalili H
Article: COLORECTAL DISEASE. 2022;24(4):470-483

Tumour necrosis factor inhibitors in Crohn's disease and the effect on surgery rates.

Eberhardson M; Myrelid P; Söderling JK; Ekbom A; SWIBREG Study Group; Everhov ÅH; Hedin CRH; Neovius M; Ludvigsson JF; Olén O
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2022;55(6):691-699

A nationwide cohort study of the incidence of inflammatory bowel disease in Sweden from 1990 to 2014.

Forss A; Clements M; Bergman D; Roelstraete B; Kaplan GG; Myrelid P; Halfvarson J; Olén O; Ludvigsson JF
Article: CLINICAL EPIDEMIOLOGY. 2022;14:591-600

Identification of Childhood-Onset Inflammatory Bowel Disease in Swedish Healthcare Registers: A Validation Study.

Mouratidou N; Malmborg P; Järås J; Sigurdsson V; Sandström O; Fagerberg UL; Bröms G; Ludvigsson JF; Olén O; SWIBREG Study Group
Article: CLINICAL EPIDEMIOLOGY. 2022;14:889-900

Normal Gastrointestinal Mucosa at Biopsy and Overall Mortality: Nationwide Population-Based Cohort Study.

Ludvigsson JF; Sun J; Olén O; Song M; Halfvarson J; Roelstraete B; Khalili H; Fang F
Article: FRONTIERS IN PAIN RESEARCH. 2022;3:962037

Parental responses and catastrophizing in online cognitive behavioral therapy for pediatric functional abdominal pain: A mediation analysis of a randomized controlled trial.

Lalouni M; Bujacz A; Bonnert M; Jensen KB; Rosengren A; Hedman-Lagerlöf E; Serlachius E; Olén O; Ljótsson B
Journal article: NEPHROLOGY DIALYSIS TRANSPLANTATION. 2022;37:I367

ESTIMATED GLOMERULAR FILTRATION RATE AND THE RISK OF INFLAMMATORY BOWEL DISEASE IN ADULTS: A SWEDISH POPULATION-BASED STUDY

Yang Y; Ludvigsson J; Olen O; Sjolander A; Carrero JJ
Article: EUROPEAN JOURNAL OF INTERNAL MEDICINE. 2021;94:85-92

Diagnostic yield of endoscopy in irritable bowel syndrome: A nationwide prevalence study 1987-2016.

Staller K; Olén O; Söderling J; Roelstraete B; Törnblom H; Khalili H; Song M; Ludvigsson JF
Article: JOURNAL OF CROHNS & COLITIS. 2021;15(11):1824-1836

Association Between Inflammatory Bowel Disease and Psychiatric Morbidity and Suicide: A Swedish Nationwide Population-Based Cohort Study With Sibling Comparisons.

Ludvigsson JF; Olén O; Larsson H; Halfvarson J; Almqvist C; Lichtenstein P; Butwicka A
Article: JOURNAL OF PEDIATRICS. 2021;238:66-73.e1

Serious Infections in Pediatric Inflammatory Bowel Disease 2002-2017-A Nationwide Cohort Study.

Ludvigsson JF; Sachs MC; Järås J; Malmborg P; Olén O
Article: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2021;56(10):1152-1162

Adult-onset inflammatory bowel disease and rate of serious infections compared to the general population: a nationwide register-based cohort study 2002-2017.

Ludvigsson JF; Holmgren J; Grip O; Halfvarson J; Askling J; Sachs MC; Olén O
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2021;54(7):931-943

Predictors of drug survival: A cohort study comparing anti-tumour necrosis factor agents using the Swedish inflammatory bowel disease quality register.

Visuri I; Eriksson C; Olén O; Cao Y; Mårdberg E; Grip O; Gustavsson A; Hjortswang H; Karling P; Montgomery S; Myrelid P; SWIBREG study group; Ludvigsson JF; Halfvarson J
Article: BMC MEDICINE. 2021;19(1):214

Allergy-related diseases in childhood and risk for abdominal pain-related functional gastrointestinal disorders at 16 years-a birth cohort study.

Sjölund J; Kull I; Bergström A; Järås J; Ludvigsson JF; Törnblom H; Simrén M; Olén O
Article: JOURNAL OF CROHNS & COLITIS. 2021;15(6):980-987

Women's Earnings are more Affected by Inflammatory Bowel Disease than Men's: A Register-Based Swedish Cohort Study.

Everhov ÅH; Bruze G; Söderling J; Askling J; Halfvarson J; Westberg K; Malmborg P; Nordenvall C; Ludvigsson JF; Olén O
Article: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2021;56(6):680-686

Prospective observational study on Stelara (ustekinumab) assessing effectiveness in Crohn's disease (PROSE): a 16-week follow-up.

Forss A; Clements M; Myrelid P; Strid H; Söderman C; Wagner A; Andersson D; Hjelm F; PROSE SWIBREG study group; Olén O; Ludvigsson JF; Halfvarson J
Article: GASTROENTEROLOGY. 2021;160(7):2585-2587.e3

Association Between Collagenous and Lymphocytic Colitis and Risk of Severe Coronavirus Disease 2019.

Khalili H; Zheng T; Söderling J; Larsson E; COVID-19 and microscopic colitis collaborators; Munch A; Sjoberg K; Almer S; Vigren L; Janczewska I; Ohlsson B; Bresso F; Mellander M-R; Olén O; Roelstraete B; Franke A; Simon TG; D'Amato M; Ludvigsson JF
Article: JOURNAL OF CROHNS & COLITIS. 2021;15(5):757-765

Association Between Statin Use and Inflammatory Bowel Diseases: Results from a Swedish, Nationwide, Population-based Case-control Study.

Lochhead P; Khalili H; Sachs MC; Chan AT; Olén O; Ludvigsson JF
Article: CANCER EPIDEMIOLOGY BIOMARKERS & PREVENTION. 2021;30(5):886-894

Hepatobiliary Cancer Risk in Patients with Inflammatory Bowel Disease: A Scandinavian Population-Based Cohort Study.

Erichsen R; Olén O; Sachs MC; Pedersen L; Halfvarson J; Askling J; Ekbom A; Ludvigsson JF; Sørensen HT
Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2021;19(5):930-938.e8

Prevalence and Progression of Recurrent Abdominal Pain, From Early Childhood to Adolescence.

Sjölund J; Uusijärvi A; Tornkvist NT; Kull I; Bergström A; Alm J; Törnblom H; Olén O; Simrén M
Article: JOURNAL OF PEDIATRIC GASTROENTEROLOGY AND NUTRITION. 2021;72(5):e119-e124

Long-term Follow-up for Missed Cases of Eosinophilic Esophagitis in Children With Previous Foreign Body in the Esophagus.

Thulin H; Nilsson C; Svensson JF; Olén O; Altman M
Journal article: GASTROHEP. 2021;3(3):131-140

Mortality in patients hospitalised for diverticulitis in Sweden—A national population‐based cohort study

Granlund J; Sköldberg F; Hjern F; Discacciati A; Sandvei MS; Olén O; Schmidt PT
Article: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2021;56(4):410-421

Capturing biologic treatment for IBD in the Swedish Prescribed Drug Register and the Swedish National Patient Register - a validation study.

Bröms G; Söderling J; Sachs MC; Halfvarson J; SWIBREG study group; Myrelid P; Ludvigsson JF; Everhov ÅH; Olén O
Article: GASTROENTEROLOGY. 2021;160(5):1599-1607.e5

Gastrointestinal Infection and Risk of Microscopic Colitis: A Nationwide Case-Control Study in Sweden.

Khalili H; Axelrad JE; Roelstraete B; Olén O; D'Amato M; Ludvigsson JF
Article: UNITED EUROPEAN GASTROENTEROLOGY JOURNAL. 2021;9(2):177-192

Inflammatory bowel disease and risk of severe COVID-19: A nationwide population-based cohort study in Sweden.

Ludvigsson JF; Axelrad J; Halfvarson J; Khalili H; Larsson E; Lochhead P; Roelstraete B; Simon TG; Söderling J; Olén O
Article: GUT. 2021;70(2):297-308

Inflammatory bowel disease and risk of small bowel cancer: a binational population-based cohort study from Denmark and Sweden.

Axelrad JE; Olén O; Sachs MC; Erichsen R; Pedersen L; Halfvarson J; Askling J; Ekbom A; Sørensen HT; Ludvigsson JF
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2021;53(4):471-483

Drug survival of anti-TNF agents compared with vedolizumab as a second-line biological treatment in inflammatory bowel disease: results from nationwide Swedish registers.

Rundquist S; Sachs MC; Eriksson C; Olén O; Montgomery S; Halfvarson J; SWIBREG Study Group
Article: JOURNAL OF PSYCHOSOMATIC RESEARCH. 2021;140:110287

Breaking the vicious circle of fear and avoidance in children with abdominal pain: A mediation analysis.

Lalouni M; Hesser H; Bonnert M; Hedman-Lagerlöf E; Serlachius E; Olén O; Ljótsson B
Article: LANCET GASTROENTEROLOGY & HEPATOLOGY. 2020;5(11):986-995

Antibiotic use and the development of inflammatory bowel disease: a national case-control study in Sweden.

Nguyen LH; Örtqvist AK; Cao Y; Simon TG; Roelstraete B; Song M; Joshi AD; Staller K; Chan AT; Khalili H; Olén O; Ludvigsson JF
Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2020;18(11):2491-2499.e3

Mortality of Patients With Microscopic Colitis in Sweden.

Khalili H; Bergman D; Roelstraete B; Burke KE; Sachs MC; Olén O; Ludvigsson JF
Article: BRITISH JOURNAL OF SURGERY. 2020;107(11):1529-1538

Decrease in primary but not in secondary abdominal surgery for Crohn's disease: nationwide cohort study, 1990-2014.

Kalman TD; Everhov ÅH; Nordenvall C; Sachs MC; Halfvarson J; Ekbom A; Ludvigsson JF; Myrelid P; Olén O
Article: GUT. 2020;69(9):gutjnl-2019-319505-1644

Adherence to a Mediterranean diet is associated with a lower risk of later-onset Crohn's disease: results from two large prospective cohort studies.

Khalili H; Håkansson N; Chan SS; Chen Y; Lochhead P; Ludvigsson JF; Chan AT; Hart AR; Olén O; Wolk A
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2020;52(4):655-668

Healthcare use, work loss and total costs in incident and prevalent Crohn's disease and ulcerative colitis: results from a nationwide study in Sweden.

Khalili H; Everhov ÅH; Halfvarson J; Ludvigsson JF; Askling J; Myrelid P; Söderling J; Olen O; Neovius M; SWIBREG Group
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2020;52(1):143-154

Inflammatory bowel disease and pancreatic cancer: a Scandinavian register-based cohort study 1969-2017.

Everhov ÅH; Erichsen R; Sachs MC; Pedersen L; Halfvarson J; Askling J; Ekbom A; Ludvigsson JF; Sørensen HT; Olén O
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2020;51(11):1022-1030

Vagotomy and subsequent risk of inflammatory bowel disease: a nationwide register-based matched cohort study.

Liu B; Wanders A; Wirdefeldt K; Sjölander A; Sachs MC; Eberhardson M; Ye W; Ekbom A; Olén O; Ludvigsson JF
Article: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2020;115(5):746-755

Mortality Risk in Irritable Bowel Syndrome: Results From a Nationwide Prospective Cohort Study.

Staller K; Olén O; Söderling J; Roelstraete B; Törnblom H; Khalili H; Joshi AD; Nguyen LH; Song M; Kuo B; Chan AT; Ludvigsson JF
Article: LANCET GASTROENTEROLOGY & HEPATOLOGY. 2020;5(5):475-484

Colorectal cancer in Crohn's disease: a Scandinavian population-based cohort study.

Olén O; Erichsen R; Sachs MC; Pedersen L; Halfvarson J; Askling J; Ekbom A; Sørensen HT; Ludvigsson JF
Article: GASTROENTEROLOGY. 2020;158(6):1574-1583.e2

Microscopic Colitis and Risk of Inflammatory Bowel Disease in a Nationwide Cohort Study.

Khalili H; Burke KE; Roelstraete B; Sachs MC; Olén O; Ludvigsson JF
Article: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2020;55(4):430-435

The use of ICD codes to identify IBD subtypes and phenotypes of the Montreal classification in the Swedish National Patient Register.

Shrestha S; Olén O; Eriksson C; Everhov ÅH; Myrelid P; Visuri I; Ludvigsson JF; Schoultz I; Montgomery S; Sachs MC; Halfvarson J; SWIBREG Study Group; Olsson M; Hjortswang H; Bengtsson J; Strid H; Andersson M; Jäghult S; Eberhardson M; Nordenvall C; Björk J; Fagerberg UL; Rejler M; Grip O; Karling P; Block M; Angenete E; Hellström PM; Gustavsson A
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2020;51(8):789-800

Adult height in patients with childhood-onset inflammatory bowel disease: a nationwide population-based cohort study.

Mouratidou N; Malmborg P; Sachs MC; Askling J; Ekbom A; Neovius M; Smedby KE; Sävendahl L; Ludvigsson JF; Olén O
Article: GUT. 2020;69(3):453-461

Mortality in adult-onset and elderly-onset IBD: a nationwide register-based cohort study 1964-2014.

Olén O; Askling J; Sachs MC; Neovius M; Smedby KE; Ekbom A; Ludvigsson JF
Article: LANCET. 2020;395(10218):123-131

Colorectal cancer in ulcerative colitis: a Scandinavian population-based cohort study.

Olén O; Erichsen R; Sachs MC; Pedersen L; Halfvarson J; Askling J; Ekbom A; Sørensen HT; Ludvigsson JF
Article: CLINICAL EPIDEMIOLOGY. 2020;12:273-285

Work Loss in Relation to Pharmacological and Surgical Treatment for Crohn's Disease: A Population-Based Cohort Study.

Everhov ÅH; Sachs MC; Ludvigsson JF; Khalili H; Askling J; Neovius M; Myrelid P; Halfvarson J; Nordenvall C; Söderling J; Olén O; SWIBREG study group
Article: CLINICAL EPIDEMIOLOGY. 2020;12:1059-1072

A Novel Method for Quantifying Intestinal Inflammatory Burden in Inflammatory Bowel Disease Using Register Data.

Axelrad JE; Sachs MC; Ludvigsson JF; Olén O; SWIBREG Study Group
Article: BMC MEDICAL INFORMATICS AND DECISION MAKING. 2019;19(1):217

Validating surgical procedure codes for inflammatory bowel disease in the Swedish National Patient Register.

Forss A; Myrelid P; Olén O; Everhov ÅH; Nordenvall C; Halfvarson J; Ludvigsson JF
Article: JOURNAL OF THE ROYAL STATISTICAL SOCIETY SERIES C-APPLIED STATISTICS. 2019;68(5):1431-1446

Ensemble prediction of time-to-event outcomes with competing risks: a case-study of surgical complications in Crohn's disease

Sachs MC; Discacciati A; Everhov AH; Olen O; Gabriel EE
Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2019;17(12):2523-2532.e1

Obesity and Weight Gain Since Early Adulthood Are Associated With a Lower Risk of Microscopic Colitis.

Liu P-H; Burke KE; Ananthakrishnan AN; Lochhead P; Olen O; Ludvigsson JF; Richter JM; Chan AT; Khalili H
Article: LANCET GASTROENTEROLOGY & HEPATOLOGY. 2019;4(11):845-853

Use of tumour necrosis factor-α inhibitors and the risk of serious infection in paediatric inflammatory bowel disease in Denmark: a nationwide cohort study.

Wintzell V; Svanström H; Melbye M; Jess T; Olén O; Ludvigsson JF; Pasternak B
Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2019;17(11):2236-2244.e11

Clinical and Cost Effectiveness of Online Cognitive Behavioral Therapy in Children With Functional Abdominal Pain Disorders.

Lalouni M; Ljótsson B; Bonnert M; Ssegonja R; Benninga M; Bjureberg J; Högström J; Sahlin H; Simrén M; Feldman I; Hedman-Lagerlöf E; Serlachius E; Olén O
Article: JAMA PEDIATRICS. 2019;173(10):969-978

Association of Childhood-Onset Inflammatory Bowel Disease With Risk of Psychiatric Disorders and Suicide Attempt.

Butwicka A; Olén O; Larsson H; Halfvarson J; Almqvist C; Lichtenstein P; Serlachius E; Frisén L; Ludvigsson JF
Article: INFLAMMATORY BOWEL DISEASES. 2019;25(10):1663-1673

Effects of Childhood-onset Inflammatory Bowel Disease on School Performance: A Nationwide Population-based Cohort Study Using Swedish Health and Educational Registers.

Malmborg P; Mouratidou N; Sachs MC; Hammar U; Khalili H; Neovius M; Hjern A; Smedby KE; Ekbom A; Askling J; Ludvigsson JF; Olén O
Article: INFLAMMATORY BOWEL DISEASES. 2019;25(7):1237-1247

Work Loss Before and After Diagnosis of Crohn's Disease.

Everhov ÅH; Khalili H; Askling J; Myrelid P; Ludvigsson JF; Halfvarson J; Nordenvall C; Neovius M; Söderling J; Olén O
Article: BRITISH JOURNAL OF SURGERY. 2019;106(7):930-939

Incidence and lifetime risk of hospitalization and surgery for diverticular disease.

Sköldberg F; Granlund J; Discacciati A; Hjern F; Schmidt PT; Olén O
Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2019;17(7):1311-1322.e7

Gastrointestinal Infection Increases Odds of Inflammatory Bowel Disease in a Nationwide Case-Control Study.

Axelrad JE; Olén O; Askling J; Lebwohl B; Khalili H; Sachs MC; Ludvigsson JF
Article: EUROPEAN JOURNAL OF EPIDEMIOLOGY. 2019;34(4):423-437

The longitudinal integrated database for health insurance and labour market studies (LISA) and its use in medical research.

Ludvigsson JF; Svedberg P; Olén O; Bruze G; Neovius M
Article: LANCET CHILD & ADOLESCENT HEALTH. 2019;3(3):158-165

Association between use of azathioprine and risk of acute pancreatitis in children with inflammatory bowel disease: a Swedish-Danish nationwide cohort study.

Wintzell V; Svanström H; Olén O; Melbye M; Ludvigsson JF; Pasternak B
Article: PEDIATRIC SURGERY INTERNATIONAL. 2019;35(3):373-381

Clinical presentation of intussusception in Swedish children under 3 years of age and the validity of diagnostic coding.

Schollin Ask L; Svensson JF; Olén O; Örtqvist Å
Article: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2019;114(2):291-304

Fracture Risk in Patients With Inflammatory Bowel Disease: A Nationwide Population-Based Cohort Study From 1964 to 2014.

Ludvigsson JF; Mahl M; Sachs MC; Björk J; Michaelsson K; Ekbom A; Askling J; Backman A-S; Olén O
Article: GASTROENTEROLOGY. 2019;156(3):614-622

Increased Mortality of Patients With Childhood-Onset Inflammatory Bowel Diseases, Compared With the General Population.

Olén O; Askling J; Sachs MC; Frumento P; Neovius M; Smedby KE; Ekbom A; Malmborg P; Ludvigsson JF
Article: BMJ OPEN. 2019;9(1):e023881

Cost-effectiveness of internet-delivered cognitive-behavioural therapy for adolescents with irritable bowel syndrome.

Sampaio F; Bonnert M; Olén O; Hedman E; Lalouni M; Lenhard F; Ljótsson B; Ssegonja R; Serlachius E; Feldman I
Article: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2019;54(1):55-63

Changes in inflammatory bowel disease subtype during follow-up and over time in 44,302 patients.

Everhov ÅH; Sachs MC; Malmborg P; Nordenvall C; Myrelid P; Khalili H; Elmberg M; Ekbom A; Askling J; Jakobsson G; Halfvarson J; Ludvigsson JF; Olén O
Article: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2019;114(1):127-134

Dietary Gluten Intake and Risk of Microscopic Colitis Among US Women without Celiac Disease: A Prospective Cohort Study.

Liu P-H; Lebwohl B; Burke KE; Ivey KL; Ananthakrishnan AN; Lochhead P; Olen O; Ludvigsson JF; Richter JM; Chan AT; Khalili H
Article: BEHAVIOR THERAPY. 2019;50(1):177-188

Internet-Delivered Exposure-Based Cognitive-Behavioral Therapy for Adolescents With Functional Abdominal Pain or Functional Dyspepsia: A Feasibility Study.

Bonnert M; Olén O; Lalouni M; Hedman-Lagerlöf E; Särnholm J; Serlachius E; Ljótsson B
Article: INFLAMMATORY BOWEL DISEASES. 2019;25(1):111-123

Inflammatory Bowel Disease and Parkinson's Disease: A Nationwide Swedish Cohort Study.

Weimers P; Halfvarson J; Sachs MC; Saunders-Pullman R; Ludvigsson JF; Peter I; Burisch J; Olén O
Article: CLINICAL GASTROENTEROLOGY AND HEPATOLOGY. 2019;17(1):123-129

No Association Between Consumption of Sweetened Beverages and Risk of Later-Onset Crohn's Disease or Ulcerative Colitis.

Khalili H; Hakansson N; Chan SS; Ludvigsson JF; Olen O; Chan AT; Hart AR; Wolk A
Article: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2018;53(12):1469-1475

Validating microscopic colitis (MC) in Swedish pathology registers.

Svensson M; Bergman D; Olén O; Myrelid P; Bohr J; Wickbom A; Khalili H; Münch A; Halfvarson J; Ludvigsson JF
Article: GASTROENTEROLOGY. 2018;155(6):1764-1775.e2

Identification of Menopausal and Reproductive Risk Factors for Microscopic Colitis-Results From the Nurses' Health Study.

Burke KE; Ananthakrishnan AN; Lochhead P; Liu P-H; Olen O; Ludvigsson JF; Richter JM; Tworoger SS; Chan AT; Khalili H
Article: JOURNAL OF CROHNS & COLITIS. 2018;12(12):1418-1428

Sick Leave and Disability Pension in Prevalent Patients With Crohn's Disease.

Everhov ÅH; Khalili H; Askling J; Myrelid P; Ludvigsson JF; Halfvarson J; Nordenvall C; Söderling J; Olén O; Neovius M
Article: NEUROGASTROENTEROLOGY AND MOTILITY. 2018;30(11):e13436

Pre- and perinatal stress and irritable bowel syndrome in young adults - A nationwide register-based cohort study.

Olén O; Stephansson O; Backman A-S; Törnblom H; Simrén M; Altman M
Article: GASTROENTEROLOGY. 2018;155(4):1079-1089.e3

Sex-Based Differences in Incidence of Inflammatory Bowel Diseases-Pooled Analysis of Population-Based Studies From Western Countries.

Shah SC; Khalili H; Gower-Rousseau C; Olen O; Benchimol EI; Lynge E; Nielsen KR; Brassard P; Vutcovici M; Bitton A; Bernstein CN; Leddin D; Tamim H; Stefansson T; Loftus EV; Moum B; Tang W; Ng SC; Gearry R; Sincic B; Bell S; Sands BE; Lakatos PL; Végh Z; Ott C; Kaplan GG; Burisch J; Colombel J-F
Article: COLORECTAL DISEASE. 2018;20(9):804-812

Restorative surgery after colectomy for ulcerative colitis in England and Sweden: observations from a comparison of nationwide cohorts.

Worley G; Nordenvall C; Askari A; Pinkney T; Burns E; Akbar A; Olén O; Ekbom A; Bottai M; Myrelid P; Faiz O
Article: DISEASES OF THE COLON & RECTUM. 2018;61(7):830-839

Appendectomy and Risk of Subsequent Diverticular Disease Requiring Hospitalization: A Population-Based Case-Control Study.

Sköldberg F; Olén O; Ekbom A; Schmidt PT
Article: BEHAVIOUR RESEARCH AND THERAPY. 2018;105:27-35

The role of avoidance behavior in the treatment of adolescents with irritable bowel syndrome: A mediation analysis.

Bonnert M; Olén O; Bjureberg J; Lalouni M; Hedman-Lagerlöf E; Serlachius E; Ljótsson B
Article: NUTRIENTS. 2018;10(5):E651-651

Milk-Related Symptoms and Immunoglobulin E Reactivity in Swedish Children from Early Life to Adolescence.

Protudjer JLP; Olén O; Vetander M; Kull I; Melén E; van Hage M; Wickman M; Bergström A
Article: JOURNAL OF CROHNS & COLITIS. 2018;12(5):559-567

Smoking is Associated with an Increased Risk of Microscopic Colitis: Results From Two Large Prospective Cohort Studies of US Women.

Burke KE; Ananthakrishnan AN; Lochhead P; Olen O; Ludvigsson JF; Richter JM; Chan AT; Khalili H
Article: ACTA PAEDIATRICA. 2018;:1635-1641

Combining Rome III criteria with alarm symptoms provides high specificity but low sensitivity for functional gastrointestinal disorders in children.

Uusijärvi A; Olén O; Malmborg P; Eriksson M; Grimheden P; Arnell H
Article: INFLAMMATORY BOWEL DISEASES. 2018;24(3):624-632

Restorative Surgery in Patients With Primary Sclerosing Cholangitis and Ulcerative Colitis Following a Colectomy.

Nordenvall C; Olén O; Johan Nilsson P; Ekbom A; Bottai M; Myrelid P; Bergquist A
Article: GASTROENTEROLOGY. 2018;154(3):518-528.e15

Incidence and Treatment of Patients Diagnosed With Inflammatory Bowel Diseases at 60 Years or Older in Sweden.

Everhov ÅH; Halfvarson J; Myrelid P; Sachs MC; Nordenvall C; Söderling J; Ekbom A; Neovius M; Ludvigsson JF; Askling J; Olén O
Article: JOURNAL OF CROHNS & COLITIS. 2018;12(2):157-166

Surgical Treatment in Childhood-onset Inflammatory Bowel Disease-A Nationwide Register-based Study of 4695 Incident Patients in Sweden 2002-2014.

Nordenvall C; Rosvall O; Bottai M; Everhov ÅH; Malmborg P; Smedby KE; Ekbom A; Askling J; Ludvigsson JF; Myrelid P; Olén O
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2018;47(2):238-245

Colectomy prior to diagnosis of primary sclerosing cholangitis is associated with improved prognosis in a nationwide cohort study of 2594 PSC-IBD patients.

Nordenvall C; Olén O; Nilsson PJ; von Seth E; Ekbom A; Bottai M; Myrelid P; Bergquist A
Article: BMJ-BRITISH MEDICAL JOURNAL. 2017;358:j3951

Childhood onset inflammatory bowel disease and risk of cancer: a Swedish nationwide cohort study 1964-2014.

Olén O; Askling J; Sachs MC; Frumento P; Neovius M; Smedby KE; Ekbom A; Malmborg P; Ludvigsson JF
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2017;46(6):589-598

Anti-TNF treatment in Crohn's disease and risk of bowel resection-a population based cohort study.

Eberhardson M; Söderling JK; Neovius M; Cars T; Myrelid P; Ludvigsson JF; Askling J; Ekbom A; Olén O
Article: JMIR MENTAL HEALTH. 2017;4(3):e32

Internet-Delivered Cognitive Behavioral Therapy for Children With Pain-Related Functional Gastrointestinal Disorders: Feasibility Study.

Lalouni M; Ljótsson B; Bonnert M; Hedman-Lagerlöf E; Högström J; Serlachius E; Olén O
Article: ACTA PAEDIATRICA. 2017;106(8):1309-1316

Receiving early information and trusting Swedish child health centre nurses increased parents' willingness to vaccinate against rotavirus infections.

Schollin Ask L; Hjern A; Lindstrand A; Olen O; Sjögren E; Blennow M; Örtqvist Å
Article: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2017;52(2):216-221

Validating inflammatory bowel disease (IBD) in the Swedish National Patient Register and the Swedish Quality Register for IBD (SWIBREG).

Jakobsson GL; Sternegård E; Olén O; Myrelid P; Ljung R; Strid H; Halfvarson J; Ludvigsson JF
Article: BMC GASTROENTEROLOGY. 2017;17(1):23

Prevalence of paediatric inflammatory bowel disease in Sweden: a nationwide population-based register study.

Ludvigsson JF; Büsch K; Olén O; Askling J; Smedby KE; Ekbom A; Lindberg E; Neovius M
Article: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2017;112(1):152-162

Internet-Delivered Cognitive Behavior Therapy for Adolescents With Irritable Bowel Syndrome: A Randomized Controlled Trial.

Bonnert M; Olén O; Lalouni M; Benninga MA; Bottai M; Engelbrektsson J; Hedman E; Lenhard F; Melin B; Simrén M; Vigerland S; Serlachius E; Ljótsson B
Article: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2016;111(11):1614-1620

Oral Contraceptive Use and Risk of Ulcerative Colitis Progression: A Nationwide Study.

Khalili H; Neovius M; Ekbom A; Ludvigsson JF; Askling J; Chan AT; Olen O
Article: JOURNAL OF CROHNS & COLITIS. 2016;10(10):1165-1171

The Fate of Reconstructive Surgery Following Colectomy for Inflammatory Bowel Disease in Sweden: A Population-based Cohort Study.

Nordenvall C; Olén O; Nilsson PJ; Ekbom A; Bottai M; Myrelid P
Article: ACTA PAEDIATRICA. 2016;105(8):971-978

Irritable bowel syndrome and functional abdominal pain in five-year-old children are related to lifestyle.

Uusijärvi A; Alm J; Lindblad F; Olén O
Article: GASTROENTEROLOGY. 2016;150(7):1561-1567.e1

Association Between Long-term Oral Contraceptive Use and Risk of Crohn's Disease Complications in a Nationwide Study.

Khalili H; Granath F; Smedby KE; Ekbom A; Neovius M; Chan AT; Olen O
Article: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2016;51(2):203-210

A population-based case-control study on statin exposure and risk of acute diverticular disease.

Sköldberg F; Svensson T; Olén O; Hjern F; Schmidt PT; Ljung R
Article: PLOS ONE. 2016;11(10):e0164647

Exposure-Based Cognitive Behavior Therapy for Children with Abdominal Pain: A Pilot Trial.

Lalouni M; Olén O; Bonnert M; Hedman E; Serlachius E; Ljótsson B
Journal article: MEDEDPUBLISH. 2016;:71

Enhancing evidence based medicine: Twelve tips for conducting register-based research

Brooke H; Holzmann M; Olén O; Talbäck M; Feychting M; Berglund A; Ludvigsson J; Ljung R
Article: COLORECTAL DISEASE. 2015;17(10):882-890

Probability, rate and timing of reconstructive surgery following colectomy for inflammatory bowel disease in Sweden: a population-based cohort study.

Nordenvall C; Myrelid P; Ekbom A; Bottai M; Smedby KE; Olén O; Nilsson PJ
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2014;40(11-12):1349-1358

Allergy-related diseases and recurrent abdominal pain during childhood - a birth cohort study.

Olén O; Neuman Å; Koopmann B; Ludvigsson JF; Ballardini N; Westman M; Melén E; Kull I; Simrén M; Bergström A
Article: NEUROGASTROENTEROLOGY AND MOTILITY. 2014;26(10):1417-1425

NPSR1 polymorphisms influence recurrent abdominal pain in children: a population-based study.

Henström M; Zucchelli M; Söderhäll C; Bergström A; Kere J; Melén E; Olén O; D'Amato M
Journal article: INTERNET INTERVENTIONS-THE APPLICATION OF INFORMATION TECHNOLOGY IN MENTAL AND BEHAVIOURAL HEALTH. 2014;1(3):141-148

Internet-delivered cognitive behavior therapy for adolescents with functional gastrointestinal disorders — An open trial

Bonnert M; Ljótsson B; Hedman E; Andersson J; Arnell H; Benninga MA; Simrén M; Thulin H; Thulin U; Vigerland S; Serlachius E; Olén O
Article: NEUROGASTROENTEROLOGY AND MOTILITY. 2014;26(6):841-850

Use of antibiotics in infancy and childhood and risk of recurrent abdominal pain--a Swedish birth cohort study.

Uusijärvi A; Bergström A; Simrén M; Ludvigsson JF; Kull I; Wickman M; Alm J; Olén O
Article: PEDIATRICS. 2014;133(2):211-218

Usefulness of symptoms to screen for celiac disease.

Rosén A; Sandström O; Carlsson A; Högberg L; Olén O; Stenlund H; Ivarsson A
Article: BMC GASTROENTEROLOGY. 2013;13:89

A large nationwide population-based case-control study of the association between intussusception and later celiac disease.

Ludvigsson JF; Nordenskjöld A; Murray JA; Olén O
Article: LAKARTIDNINGEN. 2013;110(7):334-337

[Studying rare outcomes].

Reutfors J; Olén O; Magnusson C; Pettersson A
Article: JOURNAL OF PEDIATRIC GASTROENTEROLOGY AND NUTRITION. 2012;55(6):695-700

Antibodies against deamidated gliadin peptides and tissue transglutaminase for diagnosis of pediatric celiac disease.

Olen O; Gudjónsdóttir AH; Browaldh L; Hessami M; Elvin K; Liedberg A-S; Neovius M; Grahnquist L
Article: DIGESTIVE AND LIVER DISEASE. 2012;44(6):471-476

Socioeconomic position and education in patients with coeliac disease.

Olén O; Bihagen E; Rasmussen F; Ludvigsson JF
Article: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2012;35(9):1103-1107

The genetic influence on diverticular disease--a twin study.

Granlund J; Svensson T; Olén O; Hjern F; Pedersen NL; Magnusson PKE; Schmidt PT
Article: DIGESTIVE AND LIVER DISEASE. 2011;43(11):862-868

Coeliac disease characteristics, compliance to a gluten free diet and risk of lymphoma by subtype.

Olén O; Askling J; Ludvigsson JF; Hildebrand H; Ekbom A; Smedby KE
Article: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2009;44(10):1198-1206

Coeliac disease and body mass index: a study of two Swedish general population-based registers.

Olén O; Montgomery SM; Marcus C; Ekbom A; Ludvigsson JF
Article: GUT. 2008;57(8):1074-1080

Coeliac disease and risk of sepsis.

Ludvigsson JF; Olén O; Bell M; Ekbom A; Montgomery SM
Article: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2008;43(4):416-422

Increased risk of immune thrombocytopenic purpura among inpatients with coeliac disease.

Olén O; Montgomery SM; Elinder G; Ekbom A; Ludvigsson JF
Article: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2007;42(2):186-193

Urinary tract infections in pregnant women with coeliac disease.

Olén O; Montgomery SM; Ekbom A; Bollgren I; Ludvigsson JF
Article: NEPHROLOGY DIALYSIS TRANSPLANTATION. 2006;21(7):1809-1815

Coeliac disease and risk of renal disease-a general population cohort study.

Ludvigsson JF; Montgomery SM; Olén O; Ekbom A; Ludvigsson J; Fored M
Journal article: JOURNAL OF PEDIATRIC GASTROENTEROLOGY AND NUTRITION. 2006;42(5):e14

CELIAC DISEASE AND RISK OF ITP‐ A POPULATION COHORT STUDY

Olén O; Montgomery S; Ekbom A; Elinder G; Ludvigsson J
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P648 Dietary therapy using a short course of Exclusive Enteral Nutrition followed by the Crohn’s Disease Exclusion Diet in children with mild to severe Crohn’s Disease; maintenance update on the DIETOMICS trial

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Atia O; Bryder N; Mendelovici A; Ledderman N; Ben-Tov A; Osooli M; Forss A; Weisband YL; Matz E; Dotan I; Turner D; Olén O
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P1047 Observational study of tofacitinib in Ulcerative Colitis in Sweden (ODEN) – Interim analysis of health-related quality of life and fatigue

Nyberg L; Söderling J; Olén O; Strid H; Jäghult S; Halfvarson J; Hedin C; Jónsdóttir S; Hjortswang H; Cappelleri JC; Henrohn D; Seddighzadeh M; Marsal J; Grip O
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Nyberg L; Söderling J; Olén O; Strid H; Jäghult S; Halfvarson J; Hedin C; Jónsdóttir S; Hjortswang H; Cappelleri J; Henrohn D; Seddighzadeh M; Marsal J; Grip O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2024;18(Supplement_1):i1114-i1115

P570 Efficacy and safety of Adalimumab in Very Early-onset IBD- A Multicentre Study from the Paediatric IBD Porto Group of ESPGHAN

Weintraub Y; Veit LC; Hussey S; Mitrova K; Croft NM; Kang B; Granot M; D'Arcangelo G; Spencer E; Kolho KL; Yeh PJ; Sladek M; Scarallo L; Pérez LP; Afzal N; de Laffolie J; Miele E; Bramuzzo M; Olén O; Russell R; Rohani P; Tzivinikos C; Urlep D; van Rheenen P; de Ridder L; Yogev D; Schneider AM; Cohen S; Romero RG; Dipasquale V; Uhlig H; S. DS
Conference publication: JOURNAL OF CROHNS & COLITIS. 2024;18(Supplement_1):i1956-i1958

P1089 Disease characteristics at time of diagnosis of adult onset inflammatory bowel disease and the risk of venous thromboembolism in the modern era – A Swedish nationwide cohort study 2007-2021

Bröms G; Forss A; Eriksson J; Linder M; Eriksson C; Askling J; Halfvarson J; Ludvigsson JF; Olen O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2024;18(Supplement_1):i1967-i1968

P1095 Impact of inflammatory bowel disease on the risk of acute coronary syndrome: A Swedish Nationwide cohort study 2003-2021

Eriksson C; Sun J; Bryder M; Bröms G; Everhov ÅH; Forss A; Jernberg T; Ludvigsson JF; Olén O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2024;18(Supplement_1):i164-i165

DOP51 Risk of kidney failure in patients with Inflammatory Bowel Disease undergoing colectomy: a nationwide cohort study

Yang Y; Ludvigsson JF; Forss A; Faucon AL; Faye AS; Olen O; Sjölander A; Carrero JJ
Conference publication: JOURNAL OF CROHNS & COLITIS. 2024;18(Supplement_1):i1291-i1293

P680 Comparative risk of serious infection with vedolizumab vs anti-TNF in Inflammatory Bowel Disease: Results from nationwide Swedish registers

Karlqvist S; Sachs M; Eriksson C; Cao Y; Montgomery S; Ludvigsson JF; Olén O; Halfvarson J; Group TSS
Conference publication: JOURNAL OF CROHNS & COLITIS. 2024;18(Supplement_1):i2062-i2063

P1153 Hospital surgical volumes and outcomes in ileocaecal resection for Crohn’s disease in Sweden 2000-2019: A national cohort study

Soop M; Zuk D; Bryder M; Myrelid P; Thorell A; Ludvigsson JF; Olén O; Nordenvall C
Conference publication: JOURNAL OF CROHNS & COLITIS. 2024;18(Supplement_1):i1927-i1929

P1073 Opioid use Before and After First Diagnosis of Crohn’s Disease: A Swedish Nationwide Cohort Study 2008-2020

Osooli M; Bruze G; Bryder N; Nordenvall C; Myrelid P; Everhov ÅH; Olén O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2024;18(Supplement_1):i1541-i1543

P827 Has opioid use increased among adults with Crohn’s disease? A Swedish Nationwide cohort Study 2008-2020

Osooli M; Bruze G; Bryder N; Nordenvall C; Myrelid P; Hallqvist EÅ; Olén O
Preprint: RESEARCH SQUARE. 2024

The Global Evolution of Inflammatory Bowel Disease across Four Epidemiologic Stages

Kaplan G; Hracs L; Windsor J; Gorospe J; Cummings M; Coward S; Buie M; Quan J; Goddard Q; Caplan L; Markovinović A; Williamson T; Abbey Y; Abdullah M; Abreu M; Ahuja V; Ali RAR; Altuwaijri M; Balderramo D; Banerjee R; Benchimol E; Bernstein C; Brunet-Mas E; Burisch J; Chong VH; Dotan I; Dutta U; Ouali SE; Forbes A; Forss A; Gearry R; Dao VH; Hartono J; Hilmi I; Hodges P; Jones G-R; Juliao-Baños F; Kaibullayeva J; Kelly P; Kobayashi T; Kotze P; Lakatos P; Lees C; Limsrivilai J; Lo B; Loftus E; Ludvigsson J; Mak J; Miao Y; Ng KK; Okabayashi S; Olén O; Panaccione R; Paudel M; Quaresma A; Rubin D; Simadibrata M; Sun Y; Suzuki H; Toro M; Turner D; Vergara B; Wei SC; Yamamoto-Furusho J; Yang S-K; Ng S
Letter: GUT. 2024;:gutjnl-2023-331632

Familial coaggregation of inflammatory bowel disease with cardiovascular disease: a nationwide multigenerational cohort study.

Sun J; Yao J; Olén O; Halfvarson J; Bergman D; Ebrahimi F; Sundström J; Ludvigsson JF
Review: COGNITIVE BEHAVIOUR THERAPY. 2023;52(6):565-584

Psychological treatments for irritable bowel syndrome: a comprehensive systematic review and meta-analysis.

Axelsson E; Kern D; Hedman-Lagerlöf E; Lindfors P; Palmgren J; Hesser H; Andersson E; Johansson R; Olén O; Bonnert M; Lalouni M; Ljótsson B
Letter: GASTROENTEROLOGY. 2023;164(7):1343-1344

The Burden of IBD: Comparing Denmark and Sweden.

Forss A; Ludvigsson JF; Olén O
Conference publication: GASTROENTEROLOGY. 2023;164(6):s-901

Mo1768 LONG-TERM RISK OF STROKE IN PATIENTS WITH INFLAMMATORY BOWEL DISEASE: A POPULATION-BASED, SIBLING-CONTROLLED COHORT STUDY 1965-2019

Sun J; Halfvarson J; Appelros P; Bergman D; Ebrahimi F; Roelstraete B; Olen O; Ludvigsson JF
Conference publication: GASTROENTEROLOGY. 2023;164(6):s-445-s-446

Sa1818 LONG-TERM RISK OF ARRHYTHMIAS IN PATIENTS WITH INFLAMMATORY BOWEL DISEASE: A POPULATION-BASED, SIBLINGCONTROLED COHORT STUDY 1965-2019

Sun J; Roelstraete B; Svennberg E; Halfvarson J; Sundstrom J; Forss A; Olen O; Ludvigsson JF
Conference publication: GASTROENTEROLOGY. 2023;164(6):s-905

Mo1775 INFLAMMATORY BOWEL DISEASE AND RISK OF COLORECTAL POLYPS: A NATIONWIDE POPULATION-BASED COHORT STUDY FROM SWEDEN

Axelrad JE; Olen O; Soderling J; Roelstraete B; Khalili H; Song M; Faye AS; Eberhardson M; Halfvarson J; Ludvigsson JF
Conference publication: GASTROENTEROLOGY. 2023;164(6):s-424

Sa1771 ATHEROSCLEROSIS AS A RISK FACTOR FOR IBD; A POPULATION-BASED CASE-CONTROL STUDY

Faye AS; Axelrad JE; Sun J; Halfvarson J; Sundstrom J; Soderling J; Olen O; Ludvigsson JF
Conference publication: GASTROENTEROLOGY. 2023;164(6):s-139

690 STATIN USE AND RISK OF COLORECTAL CANCER IN PATIENTS WITH INFLAMMATORY BOWEL DISEASE

Sun J; Halfvarson J; Bergman D; Ebrahimi F; Roelstraete B; Olen O; Ludvigsson JF
Conference publication: JOURNAL OF CROHNS & COLITIS. 2023;17(Supplement_1):i845-i846

P716 A 2-week course of Exclusive Enteral Nutrition followed by the Crohn Disease Exclusion Diet is effective for Induction and Maintenance of Remission in children with Crohn Disease; the DIETOMICS-CD trial

Sigall-Boneh R; Navas-López VM; Hussey S; Muncunill GP; Lawrence S; Rolandsdotter HJ; Otley A; Martín-de-Carpi J; Abramas L; López MH; Castillo NE; Chen M; Hurley M; Wingate K; Olen O; yaakov M; Levine A; Van Limbergen J; Wine E
Conference publication: JOURNAL OF CROHNS & COLITIS. 2023;17:I12-I13

Absolute and relative risks of kidney and urological complications in patients with Inflammatory Bowel Disease

Yang Y; Ludviggson JF; Olen O; Sjolander A; Carrero JJ
Conference publication: JOURNAL OF CROHNS & COLITIS. 2023;17:845-846

A 2-week course of Exclusive Enteral Nutrition followed by the Crohn Disease Exclusion Diet is effective for Induction and Maintenance of Remission in children with Crohn Disease; the DIETOMICS-CD trial

Sigall-Boneh R; Navas-Lopez VM; Hussey S; Muncunill GP; Lawrence S; Rolandsdotter HJ; Otley A; Martin-de-Carpi J; Abramas L; Lopez MH; Castillo NE; Chen M; Hurley M; Wingate K; Olen O; Yaakov M; Levine A; Van Limbergen J; Wine E
Editorial comment: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2022;56(9):1423-1424

Editorial: colorectal cancer in elderly-onset IBD-what is the risk? Authors' reply.

Everhov ÅH; Olén O
Conference publication: NEPHROLOGY DIALYSIS TRANSPLANTATION. 2022;37(Supplement_3):gfac071.039

MO508: Estimated Glomerular Filtration Rate and the Risk of Inflammatory Bowel Disease in Adults: A Swedish Population-Based Study

Yang Y; Ludvigsson J; Olén O; Sjolander A; Carrero JJ
Conference publication: GASTROENTEROLOGY. 2022;162(7):s-426-s-427

Sa1586: TRENDS IN CORTICOSTEROID (CS) USE OVER TIME AND FOLLOWING DIAGNOSIS IN PATIENTS WITH INFLAMMATORY BOWEL DISEASE (IBD), USING IBM® MARKETSCAN®

Raine T; Melmed G; Finney-Hayward TK; Clark R; Chapman JC; Targownik LE; Burisch JM; Olen O
Conference publication: GASTROENTEROLOGY. 2022;162(7):s-33

173: HEALTH-RELATED QUALITY OF LIFE (HRQOL) AND IRRITABLE BOWEL SYNDROME (IBS) FROM ADOLESCENCE TO YOUNG ADULTHOOD- A SWEDISH BIRTH COHORT STUDY

Sjölund J; Kull I; Bergström A; Ljótsson B; Törnblom H; Olen O; Simren M
Conference publication: JOURNAL OF CROHNS & COLITIS. 2022;16(Supplement_1):i454-i455

P488 Trends in corticosteroid (CS) use over time and following diagnosis in patients with Inflammatory Bowel Disease (IBD), using IBM® MarketScan®

Raine T; Melmed GY; Finney-Hayward T; Clark R; Chapman JC; Targownik L; Burisch J; Olen O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2022;16:I454-I455

Trends in corticosteroid (CS) use over time and following diagnosis in patients with Inflammatory Bowel Disease (IBD), using IBM® MarketScan®

Raine T; Melmed GY; Finney-Hayward T; Clark R; Chapman JC; Targownik L; Burisch J; Olen O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2022;16:I454-I455

Trends in corticosteroid (CS) use over time and following diagnosis in patients with Inflammatory Bowel Disease (IBD), using IBM® MarketScan®

Raine T; Melmed GY; Finney-Hayward T; Clark R; Chapman JC; Targownik L; Burisch J; Olen O
Editorial comment: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2021;54(6):848-849

Editorial: infliximab or adalimumab as first- or second-line anti-TNF-conflicting evidence-authors' reply.

Visuri I; Eriksson C; Olén O; Cao Y; Mårdberg E; Grip O; Gustavsson A; Hjortswang H; Karling P; Montgomery S; Myrelid P; Ludvigsson JF; Halfvarson J
Letter: JOURNAL OF CROHNS & COLITIS. 2021;15(8):1403-1404

Statin Use and Risk of Inflammatory Bowel Diseases: Authors' Reply.

Lochhead P; Khalili H; Sachs MC; Chan AT; Olén O; Ludvigsson JF
Meeting abstract: JOURNAL OF CROHNS & COLITIS. 2021;15:S317

Drug survival and remission rates in ustekinumab treated ulcerative colitis: Results from the Swedish Inflammatory Bowel Disease register (SWIBREG)

Thunberg J; Bjorkqvist O; Olen O; Ludvigsson JF; Eriksson C; Halfvarson J
Letter: GUT. 2021;70(5):998

Reply: Survival in Crohn's disease-associated small bowel adenocarcinoma.

Axelrad JE; Olén O; Sachs MC; Erichsen R; Pedersen L; Halfvarson J; Askling J; Ekbom A; Sørensen HT; Ludvigsson JF
Letter: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2021;53(9):1046-1047

Letter: vedolizumab or a second anti-TNF-no difference in efficacy for primary biologic failures with IBD. Authors' reply.

Rundquist S; Sachs MC; Eriksson C; Olén O; Montgomery S; Halfvarson J
Conference publication: GASTROENTEROLOGY. 2021;160(6):s-80

391 OBESITY IS ASSOCIATED WITH INCREASED RISK OF OLDER ONSET CROHN'S DISEASE: RESULTS FROM THE DEFINE-IBD CONSORTIUM

Chan S; Chen Y; Casey K; Olen O; Ludvigsson JF; Carbonnel F; Oldenburg B; Gunter M; Tj⊘nneland A; Grip O; Lochhead P; Chan A; Wolk A; Khalili H
Letter: BRITISH JOURNAL OF SURGERY. 2021;108(2):e98

Response to comments on Decrease in primary but not in secondary abdominal surgery for Crohn's disease: nationwide cohort study, 1990-2014.

Kalman TD; Myrelid P; Olén O
Editorial comment: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2021;53(5):642-643

Editorial: anti-TNF agents against vedolizumab as a second-line treatment? Not surprising tie game-authors' reply.

Rundquist S; Sachs MC; Eriksson C; Olén O; Montgomery S; Halfvarson J
Published conference paper: DISEASES OF THE COLON & RECTUM. 2021;64(3):301-312

Restorative Surgery Is More Common in Ulcerative Colitis Patients With a High Income: A Population-Based Study.

Nordenvall C; Westberg K; Söderling J; Everhov ÅH; Halfvarson J; Ludvigsson JF; Myrelid P; Olén O
Conference publication: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2020;115(1):s324-s325

S0647 Endoscopic and Histologic Activity Predict Inflammatory Bowel Disease-Related Hospitalization: A Nationwide Study

Axelrad JE; Sachs M; Ludvigsson JF; Olén O
Letter: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2020;52(3):560-561

Letter: is unrealised adult height resulting from paediatric Crohn's disease associated with a potential reduction in lifetime earnings? Authors' reply.

Mouratidou N; Malmborg P; Olén O
Conference publication: GASTROENTEROLOGY. 2020;158(6):s-171

846 ANTIBIOTIC USE AND THE DEVELOPMENT OF INFLAMMATORY BOWEL DISEASE: A NATIONAL CASE/CONTROL STUDY

Nguyen LH; Ortqvist AK; Cao Y; Simon TG; Roelstraete B; Song M; Joshi AD; Staller K; Chan AT; Khalili H; Olen O; Ludvigsson JF
Conference publication: GASTROENTEROLOGY. 2020;158(6):s-171-s-172

848 ASSOCIATION BETWEEN STATIN USE AND RISK OF INFLAMMATORY BOWEL DISEASES

Lochhead P; Khalili H; Sachs MC; Olen O; Ludvigsson JF
Conference publication: GASTROENTEROLOGY. 2020;158(6):s-362

Sa1634 ALLERGY-RELATED DISEASES DURING CHILDHOOD AND RISK OF IRRITABLE BOWEL SYNDROME AT 16 YEARS- A SWEDISH BIRTH COHORT STUDY

Sjölund J; Kull I; Bergström A; Törnblom H; Simren M; Olen O
Conference publication: GASTROENTEROLOGY. 2020;158(6):s-157-s-158

762 INCREASED RISK OF SMALL BOWEL CANCER AND SMALL BOWEL CANCER DEATH IN INFLAMMATORY BOWEL DISEASE: A BINATIONAL POPULATION-BASED STUDY

Axelrad JE; Olen O; Sachs MC; Erichsen R; Pedersen L; Halfvarson J; Askling J; Ekbom A; Sørensen HT; Ludvigsson JF
Conference publication: JOURNAL OF CROHNS & COLITIS. 2020;14(Supplement_1):s592-s593

P740 Age determines the risk of familial IBD: A nationwide case–control study

Halfvarson J; Ludvigsson J; Sachs M; Askling J; Olén O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2020;14(Supplement_1):s317

P327 Effectiveness of anti-TNF vs. vedolizumab as a second biologic in IBD: results from national Swedish registers

Rundquist S; Sachs M; Eriksson C; Olén O; Montgomery S; Halfvarson J
Conference publication: JOURNAL OF CROHNS & COLITIS. 2020;14(Supplement_1):s013-s014

OP14 Risk of colorectal cancer diagnosis and colorectal cancer mortality in Crohn’s disease: A Scandinavian population-based cohort study

Olen O; Erichsen R; Sachs MC; Pedersen L; Halfvarson J; Askling J; Ekbom A; Sørensen HT; Ludvigsson JF
Conference publication: JOURNAL OF CROHNS & COLITIS. 2020;14(Supplement_1):s007-s010

OP08 Inflammatory bowel disease and risk of small bowel cancer: A binational population-based cohort study from Denmark and Sweden

Axelrad J; Olen O; Sachs M; Erichsen R; Pedersen L; Halfvarson J; Askling J; Ekbom A; Sørensen HT; Ludvigsson J
Conference publication: JOURNAL OF CROHNS & COLITIS. 2020;14:S013-S014

Risk of colorectal cancer diagnosis and colorectal cancer mortality in Crohn's disease: A Scandinavian population-based cohort study

Olen O; Erichsen R; Sachs MC; Pedersen L; Halfvarson J; Askling J; Ekbom A; Sorensen HT; Ludvigsson JF
Conference publication: JOURNAL OF CROHNS & COLITIS. 2020;14:S317-S318

Effectiveness of anti-TNF vs. vedolizumab as a second biologic in IBD: results from national Swedish registers

Rundquist S; Sachs M; Eriksson C; Olen O; Montgomery S; Halfvarson J
Conference publication: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2020;115:S325

Endoscopic and Histologic Activity Predict Inflammatory Bowel Disease-Related Hospitalization: A Nationwide Study

Axelrad JE; Sachs M; Ludvigsson JF; Olen O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2020;14:S592-S593

Age determines the risk of familial IBD: A nationwide case-control study

Halfvarson J; Ludvigsson J; Sachs M; Askling J; Olen O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2020;14:S007-S009

Inflammatory bowel disease and risk of small bowel cancer: A binational population-based cohort study from Denmark and Sweden

Axelrad J; Olen O; Sachs M; Erichsen R; Pedersen L; Halfvarson J; Askling J; Ekbom A; Sorensen HT; Ludvigsson J
Preprint: RESEARCH SQUARE. 2019

Validating surgical procedure codes for inflammatory bowel disease in the Swedish National Patient Register

Forss A; Myrelid P; Olén O; Everhov Å; Nordenvall C; Halfvarson J; Ludvigsson J
Preprint: RESEARCH SQUARE. 2019

Validating surgical procedure codes for inflammatory bowel disease in the Swedish National Patient Register

Forss A; Myrelid P; Olén O; Everhov ÅH; Nordenvall C; Halfvarson J; Ludvigsson JF
Preprint: RESEARCH SQUARE. 2019

Validating surgical procedure codes for inflammatory bowel disease in the Swedish National Patient Register

Forss A; Myrelid P; Olén O; Everhov ÅH; Nordenvall C; Halfvarson J; Ludvigsson JF
Letter: INFLAMMATORY BOWEL DISEASES. 2019;25(10):e127

Inflammatory Bowel Disease and Parkinson's Disease: A Reply to Letter to the Editor of Shih-Wei Lai.

Weimers P; Halfvarson J; Saunders-Pullman R; Ludvigsson JF; Peter I; Olén O; Burisch J
Review: SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. 2019;54(9):1089-1101

Swedish Inflammatory Bowel Disease Register (SWIBREG) - a nationwide quality register.

Ludvigsson JF; Andersson M; Bengtsson J; Eberhardson M; Fagerberg UL; Grip O; Halfvarson J; Hjortswang H; Jäghult S; Karling P; Nordenvall C; Olén O; Olsson M; Rejler M; Strid H; Myrelid P
Preprint: RESEARCH SQUARE. 2019

Validating surgical procedure codes for inflammatory bowel disease in the Swedish National Patient Register

Forss A; Myrelid P; Olén O; Everhov ÅH; Nordenvall C; Halfvarson J; Ludvigsson JF
Letter: GUT. 2019;68(5):947-948

No association between urbanisation, neighbourhood deprivation and IBD: a population-based study of 4 million individuals.

Butwicka A; Sariaslan A; Larsson H; Halfvarson J; Myrelid PE; Olén O; Frisen L; Lichtenstein P; Ludvigsson JF
Corrigendum: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2019;114(5):837

Correction: Dietary Gluten Intake and Risk of Microscopic Colitis Among US Women Without Celiac Disease: A Prospective Cohort Study.

Liu P-H; Lebwohl B; Burke KE; Ivey KL; Ananthakrishnan AN; Lochhead P; Olen O; Ludvigsson JF; Richter JM; Chan AT; Khalili H
Conference publication: GASTROENTEROLOGY. 2019;156(6):s-571-s-572

Su1583 – Mortality Risk in Irritable Bowel Syndrome: Results from a Nationwide, Prospective Cohort Study

Staller K; Soderling J; Olen O; Törnblom H; Kuo B; Chan AT; Ludvigsson JF
Conference publication: GASTROENTEROLOGY. 2019;156(6):s-101

513 – Mortality in Microscopic Colitis - Results from a Nationwide Cohort Study

Khalili H; Roelstraete B; Burke KE; Bergman D; Sachs MC; Olen O; Ludvigsson JF
Preprint: ARXIV. 2019

Ensemble Prediction of Time to Event Outcomes with Competing Risks: A Case Study of Surgical Complications in Crohn's Disease

Sachs MC; Discacciati A; Everhov Å; Olén O; Gabriel EE
Letter: ACTA PAEDIATRICA. 2019;108(2):378

Reply about alarm symptoms in functional gastrointestinal disorders.

Uusijärvi A; Olén O; Malmborg P; Arnell H
Meeting abstract: JOURNAL OF CROHNS & COLITIS. 2019;13:S443-S444

Anti-TNF agent drug survival in patients with IBD: real-world comparisons of individual anti-TNF agents based on the Swedish National Quality Registry for IBD (SWIBREG)

Visuri I; Eriksson C; Mardberg E; Grip O; Gustavsson A; Hjortswang H; Karling P; Montgomery S; Myrelid P; Olen O; Ludvigsson JF; Halfvarson J
Letter: GUT. 2019;68(1):175-176

Association between inflammatory bowel disease and Parkinson's disease: seek and you shall find?

Weimers P; Halfvarson J; Sachs MC; Ludvigsson JF; Peter I; Olén O; Burisch J
Preprint: SSRN ELECTRONIC JOURNAL. 2019

Mortality in Microscopic Colitis - A Nationwide Cohort Study in Sweden

Khalili H; Bergman D; Roelstraete B; Burke KE; Sachs MC; Olén O; Ludvigsson JF
Conference publication: AMERICAN JOURNAL OF GASTROENTEROLOGY. 2018;113:S59-S60

Non-Steroidal Anti-Inflammatory Drugs and Aspirin, but Not Acetaminophen, Are Associated With an Increased Risk of Microscopic Colitis: Results From the Nurses` Health Studies

Burke KE; Liu P-H; Ananthakrishnan A; Lochhead P; Olen O; Ludvigsson J; Richter J; Chan A; Khalili H
Meeting abstract: VALUE IN HEALTH. 2018;21:S42

COST-EFFECTIVENESS OF INTERNET-DELIVERED COGNITIVE BEHAVIOUR THERAPY FOR ADOLESCENTS WITH IRRITABLE BOWEL SYNDROME

Sampaio F; Bonnert M; Olen O; Hedman E; Lalouni M; Lenhard F; Ljotsson B; Nystrand C; Ssegonja R; Serlachius E; Feldman I
Letter: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2018;47(10):1420-1421

Letter: phenotype and natural history of elderly onset inflammatory bowel disease.

Everhov ÅH; Ludvigsson JF; Olén O
Conference publication: GASTROENTEROLOGY. 2018;154(6):s-23

79 - Exposure-Based Cognitive Behavioral Therapy Delivered via Internet for Children with Functional Abdominal Pain Disorders: A Randomized Controlled Trial

Lalouni M; Ljòtsson B; Bonnert M; Benninga MA; Bjureberg J; Högström J; Sahlin H; Simren M; Hedman-Lagerlöf E; Serlachius E; Olen O
Conference publication: GASTROENTEROLOGY. 2018;154(6):s-18-s-19

55 - Sweetened Beverage Consumption and Risk of Crohn's Disease and Ulcerative Colitis: Results from two Large Prospective Cohort Studies

Khalili H; Håkansson N; Chan SS; Ludvigsson JF; Olen O; Hart A; Wolk A
Conference publication: GASTROENTEROLOGY. 2018;154(6):s-603

Su1841 - Fracture Risk in Patients with Inflammatory Bowel Disease - A Nationwide Cohort Study 1964-2014

Ludvigsson JF; Mahl M; Sachs MC; Björk J; Michaelsson K; Ekbom A; Askling J; Backman A-S; Olen O
Conference publication: GASTROENTEROLOGY. 2018;154(6):s-881

Mo2017 - Recurrent Abdominal Pain and Painful Functional Gastrointestinal Disorders from Birth to Adolescence- A Prospective Swedish Birth Cohort Study

Sjölund J; Uusijärvi A; Jossan N; Kull I; Bergström A; Törnblom H; Olen O; Simren M
Conference publication: GASTROENTEROLOGY. 2018;154(6):s-5

15 - Health Care Use, Work Loss, and Total Costs in Incident and Prevelant Ulcerative Colitis: Results from a Nationwide Study in Sweden

Khalili H; Soderling J; Everhov AH; Halfvarson J; Ludvigsson JF; Askling J; Myrelid P; Olen O; Neovius M
Conference publication: GASTROENTEROLOGY. 2018;154(6):s-492

Su1169 - Dietary Gluten Intake and Risk of Microscopic Colitis Among us Women without Celiac Disease: A Prospective Cohort Study

Liu P-H; Lebwohl B; Burke KE; Ananthakrishnan A; Lochhead P; Olen O; Ludvigsson JF; Chan AT; Khalili H
Conference publication: GASTROENTEROLOGY. 2018;154(6):s-51-s-52

194 - Menopausal and Reproductive Factors and Risk of Microscopic Colitis: Results from two Large Prospective Cohort Studies

Burke KE; Ananthakrishnan A; Lochhead P; Olen O; Ludvigsson JF; Richter J; Tworoger S; Chan AT; Khalili H
Meeting abstract: VALUE IN HEALTH. 2018;21:S85

COST-EFFECTIVENESS OF COGNITIVE BEHAVIORAL THERAPY DELIVERED VIA INTERNET FOR CHILDREN WITH FUNCTIONAL ABDOMINAL PAIN DISORDERS: EVALUATION ALONGSIDE A RANDOMIZED CONTROLLED TRIAL

Ssegonja R; Feldman I; Lalouni M; Ljotsson B; Bonnert M; Benninga M; Bjureberg J; Hogstrom J; Sahlin H; Simren M; Hedman E; Serlachius E; Olen O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2018;12(supplement_1):s522-s523

P811 Centre volume bias for restorative surgery after ulcerative colitis colectomy in England and Sweden

Worley G; Nordenvall C; Askari A; Pinkney T; Burns E; Akbar A; Olén O; Ekbom A; Bottai M; Myrelid P; Faiz O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2018;12(supplement_1):s60-s61

DOP042 Need for ileocaecal resections, but not ileo-colic re-resections, has decreased: a nationwide study of temporal trends in Crohn surgery in Sweden 1990–2014

Kalman D; Nordenvall C; Everhov AH; Sachs MC; Ludvigsson JF; Ekbom A; Myrelid P; Olén O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2018;12(suppl_1):s11-s12

OP016 Need for primary abdominal surgery, but not repeated surgery, has decreased: a nationwide study of temporal trends in Crohn surgery in Sweden 1990–2014

Kalman D; Nordenvall C; Everhov AH; Ludvigsson JF; Sachs MC; Ekbom A; Olén O; Myrelid P
Letter: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2018;47(1):147-148

Letter: biologics treatment in Crohn's disease and risk of bowel resection-what about the patients who stop anti-TNF therapy? Authors' reply.

Eberhardson M; Söderling JK; Olén O
Conference publication: PHARMACOEPIDEMIOLOGY AND DRUG SAFETY. 2018;27:196

Association between azathioprine use and risk of acute pancreatitis in pediatric inflammatory bowel disease: A nationwide Swedish cohort study

Wintzell V; Svanstrom H; Olen O; Melbye M; Ludvigsson JF; Pasternak B
Conference publication: JOURNAL OF CROHNS & COLITIS. 2018;12:S60-S61

Need for ileocaecal resections, but not ileo-colic re-resections, has decreased: a nationwide study of temporal trends in Crohn surgery in Sweden 1990-2014

Kalman D; Nordenvall C; Everhov AH; Sachs MC; Ludvigsson JF; Ekbom A; Myrelid P; Olen O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2018;12:S522-S523

Centre volume bias for restorative surgery after ulcerative colitis colectomy in England and Sweden

Worley G; Nordenvall C; Askari A; Pinkney T; Burns E; Akbar A; Olen O; Ekbom A; Bottai M; Myrelid P; Faiz O
Conference publication: JOURNAL OF CROHNS & COLITIS. 2018;12:S11-S12

Need for primary abdominal surgery, but not repeated surgery, has decreased: a nationwide study of temporal trends in Crohn surgery in Sweden 1990-2014

Kalman D; Nordenvall C; Everhov AH; Ludvigsson JF; Sachs MC; Ekbom A; Olen O; Myrelid P
Editorial comment: ALIMENTARY PHARMACOLOGY & THERAPEUTICS. 2017;45(10):1369-1370

Editorial: importance of definition of inflammatory bowel disease and an increased incidence in children.

Everhov ÅH; Olén O; Ludvigsson JF
Conference publication: JOURNAL OF CROHNS & COLITIS. 2017;11(suppl_1):s14-s15

OP024 Childhood-onset inflammatory bowel disease and risk of cancer – a Swedish nationwide cohort study 1964–2014

Olén O; Askling J; Frumento P; Sachs MC; Neovius M; Eriksson J; Smedby KE; Ekbom A; Malmborg P; Ludvigsson JF
Conference publication: ALLERGY. 2017;72:29

Prognosis of symptoms and IgE reactivity to cow's milk in Swedish children from early life to adolescence

Protudjer JL; Olen O; Vetander M; Kull I; Melen E; Van Hage M; Wickman M; Bergstrom A
Conference publication: JOURNAL OF CROHNS & COLITIS. 2017;11:S14-S15

Childhood-onset inflammatory bowel disease and risk of cancer - a Swedish nationwide cohort study 1964-2014

Olen O; Askling J; Frumento P; Sachs MC; Neovius M; Eriksson J; Smedby KE; Ekbom A; Malmborg P; Ludvigsson JF
Conference publication: JOURNAL OF CROHNS & COLITIS. 2017;11:S456-S457

The sex ratio of inflammatory bowel disease varies according to age at onset: results from a worldwide survey

Shah SC; Khalili H; Gower-Rousseau C; Olen O; Benchimol E; Lynge E; Nielsen K; Ahn H; Brassard P; Vutcovici M; Bitton A; Bernstein C; Leddin D; Tamim H; Aniwan S; Chen C-Y; Stefansson T; Loftus EVJ; Moum B; Tang W; Ng S; Gearry R; Sincic B; Bell S; Lakatos PL; Vegh Z; Ott C; Kaplan G; Burisch J; Colombel J-F
Review: CLINICAL PSYCHOLOGY REVIEW. 2016;50:1-10

Internet-delivered cognitive behavior therapy for children and adolescents: A systematic review and meta-analysis.

Vigerland S; Lenhard F; Bonnert M; Lalouni M; Hedman E; Ahlen J; Olén O; Serlachius E; Ljótsson B
Letter: GASTROENTEROLOGY. 2016;151(5):1039-1040

Reply.

Khalili H; Olén O
Meeting abstract: GASTROENTEROLOGY. 2016;150(4):S228-S229

Preliminary Effects of Exposure-Based Cognitive Behavior Therapy for Children With Pain Predominant Functional Gastrointestinal Disorders

Lalouni M; Olen O; Bonnert M; Serlachius E; Hedman E; Ljotsson B
Meeting abstract: GASTROENTEROLOGY. 2016;150(4):S99-S100

Internet-Delivered Cognitive Behavior Therapy for Adolescents With Irritable Bowel Syndrome: A Randomized Controlled Trial

Bonnert M; Olen O; Lalouni M; Hedman E; Vigerland S; Lenhard F; Benninga MA; Simren M; Serlachius E; Ljotsson B
Editorial comment: COLORECTAL DISEASE. 2015;17(10):i

Probability, rate and timing of reconstructive surgery following colectomy for inflammatory bowel disease in Sweden: a population-based cohort study. Nordenvall, C., Myrelid, P., Ekbom, A., Bottai, M., Smedby, KE, Olen, O., Nilsson, PJ

Smart N
Conference publication: GASTROENTEROLOGY. 2015;148(4):s-264-s-265

Sa1231 Oral Contraceptive Use and Risk of Surgery Among Crohn's Patients

Khalili H; Granath F; Smedby KE; Ekbom A; Chan AT; Neovius M; Olen O
Other: ACTA PAEDIATRICA. 2015;104(4):431

Practical Algorithms in Pediatric Gastroenterology. Edited by R Shaoul. S Karger AG, Basel, CH, 2014, In the Series: Practical Algorithms in Pediatrics. Series editor: Z Hochberg. Spiral‐bound. VII+110 pp. 51 graphs, nine tabs. Price $US 58, CHF 49, €41, ISBN: 978 3 318 02509 5.

Olén O
Conference publication: NEUROGASTROENTEROLOGY AND MOTILITY. 2015;27:88-89

Paediatric IBS is associated with increased levels of IL-6 in plasma

Ohman L; Isaksson S; Melen E; Kull I; Wickman M; Bergstrom A; Simren M; Olen O
Conference publication: GASTROENTEROLOGY. 2014;146(5):s-178

1013 Pre-and Perinatal Stress and Irritable Bowel Syndrome in Young Adults -A National Register-Based Cohort Study

Olen O; Stephansson O; Backman A-S; Törnblom H; Simren M; Altman M
Conference publication: GASTROENTEROLOGY. 2014;146(5):s-543

Su2089 Validation of the Use of the ICD-10 Diagnostic Code for Irritable Bowel Syndrome in the Swedish National Patient Register

Jossan N; Backman A-S; Linder M; Altman M; Simren M; Olen O; Törnblom H
Conference publication: GASTROENTEROLOGY. 2014;146(5):s-173

969 Functional Gastrointestinal Disorders and the Association to Celiac Disease -A Population Based Screening Study in Children

Olen O; Sandström O; Myléus A; Rosén A; Carlsson A; Högberg L; Stenlund H; Simren M; Ivarsson A
Conference publication: GASTROENTEROLOGY. 2014;146(5):s-897

Tu2006 Internet-Delivered Cognitive Behavior Therapy for Adolescents With Functional Gastrointestinal Disorders: A Pilot Study

Bonnert M; Ljótsson B; Hedman E; Serlachius E; Simren M; Benninga MA; Olen O
Conference publication: GASTROENTEROLOGY. 2013;144(5):s-171-s-172

949 Allergic Diseases and Recurrent Abdominal Pain During Childhood - A Swedish Birth Cohort Study

Olen O; Koopmann B; Bergström A; Melen E; Simren M; Ludvigsson JF; Wickman M; Ballardini N; Westman M; Neuman ÅI; Kull I
Conference publication: GASTROENTEROLOGY. 2013;144(5):S171-S172

Allergic Diseases and Recurrent Abdominal Pain During Childhood - A Swedish Birth Cohort Study

Olen O; Koopmann B; Bergstroem A; Melen E; Simren M; Ludvigsson JF; Wickman M; Ballardini N; Westman M; Neuman AI; Kull I
Conference publication: GASTROENTEROLOGY. 2012;142(5):s-158

902 Use of Antibiotics During Infancy and Childhood and Risk of Recurrent Abdominal Pain

Uusijärvi A; Simren M; Ludvigsson JF; Wickman M; Kull I; Alm JS; Olen O
Conference publication: NEUROGASTROENTEROLOGY AND MOTILITY. 2010;22:70

Recurrent abdominal pain in infancy and risk of recurrent abdominal pain in 12 year-old Swedish children

Olen O; Ludvigsson JF; Kull I; Wickman M; Simren M
Conference publication: JOURNAL OF PEDIATRIC GASTROENTEROLOGY AND NUTRITION. 2007;44:225

Celiac disease is a risk factor for septicaemia

Ludvigsson JF; Olen O; Olcen P; Ekbom A; Montgomery SM
Visa fler

Forskningsbidrag

Inflammatorisk tarmsjukdom och cancerrisk - ett rörligt mål i en era av nya immunmodulerande terapier

ALF

1 January 2023 - 31 December 2024
Inflammatory bowel disease and risk of cancer - a moving target in an age of new targeted therapies

Swedish Research Council

1 January 2021 - 31 December 2026
Inflammatory bowel disease and risk of cancer - a moving target in an age of new targeted therapies

Swedish Research Council

1 January 2021 - 31 December 2024
Longterm prognosis in 600,000 individuals with a normal gastrointestinal mucosa - nationwide cohort study

Swedish Research Council

1 January 2021 - 31 December 2023
Scandinavian CANcer-in-Inflammatory Bowel Disease study (SCAN-IBD)

FORTE

1 January 2018 - 31 December 2019
Inflammatory bowel disease and risk of cancer – A population-based cohort study using biopsy data from Sweden’s 28 pathology departments

Swedish Research Council for Health Working Life and Welfare

1 January 2017 - 31 December 2019
Improved access and delivery of treatment to children and adolescents through Internet-based cognitive behavior therapy: From development to implementation in regular health care

FORTE

1 January 2015 - 31 December 2020
Internetförmedlad kognitiv beteendeterapi för barn och ungdomar med funktionella buksmärtor

ALF

1 January 2014 - 31 December 2016
Internetbaserad kognitiv beteendeterapi för ungdomar med funktionella buksmärtor

Jane and Dan Olsson foundation

1 June 2013 - 31 December 2015
Internet-delivered psychological treatment for children and adolescents with functional gastrointestinal disorders

Swedish Research Council

1 January 2013 - 31 December 2016
Internet-delivered cognitive behaviour therapy for adolescents with functional gastrointestinal disorders

Kempe Carlgrenska Foundation

1 January 2012 - 31 December 2017

Anställningar

Överläkare, Sachs' Children and Youth Hospital, 2016-
Anknuten till Forskning, Klinisk forskning och utbildning, Södersjukhuset, Karolinska Institutet, 2023-2026
Adjungerad Lektor, Medicin, Solna, Karolinska Institutet, 2023-2025

Examina och utbildning

Docent, epidemiologi, Karolinska Institutet, 2020
Medicine Doktorsexamen, Institutionen för klinisk forskning o utbildning, Södersjukhuset, Karolinska Institutet, 2008

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