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Ola Olén är barnläkare och överläkare vid Sachsska barn- och ungdomssjukhusets enhet för pediatrisk gastroenterologi och nutrition. Forskningen bedrivs vid Institutionen för medicin Solna, Enheten för klinisk epidemiologi, Karolinska Institutet. För fullständig beskrivning, var god se den engelska versionen av denna sida.

Publikationer

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, et al
Gut 2019;68(1):175-176

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
The Lancet. Child & adolescent health 2019;3(3):158-165

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, et al
Scandinavian journal of gastroenterology 2019;54(1):55-63

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
Pediatric surgery international 2019;35(3):373-381

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, et al
BMJ open 2019;9(1):e023881-

Dietary Gluten Intake and Risk of Microscopic Colitis Among US Women without Celiac Disease: A Prospective Cohort Study
Liu Ph, Lebwohl B, Burke Ke, Ivey Kl, Ananthakrishnan An, Lochhead P, et al
The American journal of gastroenterology 2019;114(1):127-134

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, et al
Inflammatory bowel diseases 2019;():-

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, et al
The American journal of gastroenterology 2019;114(2):291-304

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, et al
Gastroenterology 2019;156(3):614-622

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, et al
Inflammatory bowel diseases 2019;25(1):111-123

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, et al
Behavior therapy 2019;50(1):177-188

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, et al
Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association 2019;17(1):123-129

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, et al
Gut 2019;68(5):947-948

Reply about alarm symptoms in functional gastrointestinal disorders
Uusijärvi A, Olén O, Malmborg P, Arnell H
Acta paediatrica (Oslo, Norway : 1992) 2019;108(2):378-

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
European journal of epidemiology 2019;34(4):423-437

Appendectomy and Risk of Subsequent Diverticular Disease Requiring Hospitalization: A Population-Based Case-Control Study
Sköldberg F, Olén O, Ekbom A, Schmidt Pt
Diseases of the colon and rectum 2018;61(7):830-839

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, et al
Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association 2018;():-

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, et al
Alimentary pharmacology & therapeutics 2018;47(2):238-245

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
Acta paediatrica (Oslo, Norway : 1992) 2018;():-

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, et al
Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association 2018;():-

Identification of Menopausal and Reproductive Risk Factors for Microscopic Colitis-Results From the Nurses' Health Study
Burke Ke, Ananthakrishnan An, Lochhead P, Liu Ph, Olen O, Ludvigsson Jf, et al
Gastroenterology 2018;155(6):1764-1775.e2

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, et al
Gastroenterology 2018;154(3):518-528.e15

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
Alimentary pharmacology & therapeutics 2018;47(1):147-148

Letter: phenotype and natural history of elderly onset inflammatory bowel disease
Everhov Åh, Ludvigsson Jf, Olén O
Alimentary pharmacology & therapeutics 2018;47(10):1420-1421

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, et al
Nutrients 2018;10(5):-

Obesity and Weight Gain Since Early Adulthood Are Associated With a Lower Risk of Microscopic Colitis
Liu Ph, Burke Ke, Ananthakrishnan An, Lochhead P, Olen O, Ludvigsson Jf, et al
Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association 2018;():-

Pre- and perinatal stress and irritable bowel syndrome in young adults - A nationwide register-based cohort study
Olén O, Stephansson O, Backman As, Törnblom H, Simrén M, Altman M
Neurogastroenterology and motility : the official journal of the European Gastrointestinal Motility Society 2018;30(11):e13436-

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, et al
Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland 2018;20(9):804-812

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, et al
Inflammatory bowel diseases 2018;24(3):624-632

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, et al
Gastroenterology 2018;155(4):1079-1089.e3

Sick Leave and Disability Pension in Prevalent Patients With Crohn's Disease
Everhov Åh, Khalili H, Askling J, Myrelid P, Ludvigsson Jf, Halfvarson J, et al
Journal of Crohn's & colitis 2018;12(12):1418-1428

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, et al
Journal of Crohn's & colitis 2018;12(5):559-567

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, et al
Journal of Crohn's & colitis 2018;12(2):157-166

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, et al
Behaviour research and therapy 2018;105():27-35

Validating microscopic colitis (MC) in Swedish pathology registers
Svensson M, Bergman D, Olén O, Myrelid P, Bohr J, Wickbom A, et al
Scandinavian journal of gastroenterology 2018;53(12):1469-1475

Work Loss Before and After Diagnosis of Crohn's Disease
Everhov Åh, Khalili H, Askling J, Myrelid P, Ludvigsson Jf, Halfvarson J, et al
Inflammatory bowel diseases 2018;():-

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, et al
Alimentary pharmacology & therapeutics 2017;46(6):589-598

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, et al
BMJ (Clinical research ed.) 2017;358():j3951-

Editorial: importance of definition of inflammatory bowel disease and an increased incidence in children
Everhov Åh, Olén O, Ludvigsson Jf
Alimentary pharmacology & therapeutics 2017;45(10):1369-1370

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, et al
JMIR mental health 2017;4(3):e32-

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, et al
The American journal of gastroenterology 2017;112(1):152-162

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, et al
BMC gastroenterology 2017;17(1):23-

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, et al
Acta paediatrica (Oslo, Norway : 1992) 2017;106(8):1309-1316

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, et al
Scandinavian journal of gastroenterology 2017;52(2):216-221

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
Scandinavian journal of gastroenterology 2016;51(2):203-10

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, et al
Gastroenterology 2016;150(7):1561-1567.e1

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
PloS one 2016;11(10):e0164647-

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, et al
Clinical psychology review 2016;50():1-10

Irritable bowel syndrome and functional abdominal pain in five-year-old children are related to lifestyle
Uusijärvi A, Alm J, Lindblad F, Olén O
Acta paediatrica (Oslo, Norway : 1992) 2016;105(8):971-8

Oral Contraceptive Use and Risk of Ulcerative Colitis Progression: A Nationwide Study
Khalili H, Neovius M, Ekbom A, Ludvigsson Jf, Askling J, Chan At, et al
The American journal of gastroenterology 2016;111(11):1614-1620

Reply
Khalili H, Olén O
Gastroenterology 2016;151(5):1039-1040

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
Journal of Crohn's & colitis 2016;10(10):1165-71

Paediatric IBS is associated with increased levels of IL-6 in plasma
Ohman L, Isaksson S, Melen E, Kull I, Wickman M, Bergstrom A, et al
NEUROGASTROENTEROLOGY AND MOTILITY 2015;:88-89

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, et al
Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland 2015;17(10):882-90

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, et al
Alimentary pharmacology & therapeutics 2014;40(11-12):1349-58

Functional Gastrointestinal Disorders and the Association to Celiac Disease A Population Based Screening Study in Children
Olen O, Sandstrom O, Myleus A, Rosen A, Carlsson A, Hogberg L, et al
GASTROENTEROLOGY 2014;146(5):S173-S173

Internet-Delivered Cognitive Behavior Therapy for Adolescents With Functional Gastrointestinal Disorders: A Pilot Study
Bonnert M, Ljotsson B, Hedman E, Serlachius E, Simren M, Benninga Ma, et al
GASTROENTEROLOGY 2014;146(5):S897-S897

NPSR1 polymorphisms influence recurrent abdominal pain in children: a population-based study
Henström M, Zucchelli M, Söderhäll C, Bergström A, Kere J, Melén E, et al
Neurogastroenterology and motility : the official journal of the European Gastrointestinal Motility Society 2014;26(10):1417-25

Pre- and Perinatal Stress and Irritable Bowel Syndrome in Young Adults - A National Register-Based Cohort Study
Olen O, Stephansson O, Backman As, Tornblom H, Simren M, Altman M
GASTROENTEROLOGY 2014;146(5):S178-S178

Usefulness of symptoms to screen for celiac disease
Rosén A, Sandström O, Carlsson A, Högberg L, Olén O, Stenlund H, et al
Pediatrics 2014;133(2):211-8

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, et al
Neurogastroenterology and motility : the official journal of the European Gastrointestinal Motility Society 2014;26(6):841-50

Validation of the Use of the ICD-10 Diagnostic Code for Irritable Bowel Syndrome in the Swedish National Patient Register
Jossan N, Backman As, Linder M, Altman M, Simren M, Olen O, et al
GASTROENTEROLOGY 2014;146(5):S543-S543

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
BMC gastroenterology 2013;13():89-

Allergic Diseases and Recurrent Abdominal Pain During Childhood - A Swedish Birth Cohort Study
Olen O, Koopmann B, Bergstrom A, Melen E, Simren M, Ludvigsson Jf, et al
GASTROENTEROLOGY 2013;144(5):S171-S172

[Studying rare outcomes]
Reutfors J, Olén O, Magnusson C, Pettersson A
Lakartidningen 2013;110(7):334-7

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 As, et al
Journal of pediatric gastroenterology and nutrition 2012;55(6):695-700

Socioeconomic position and education in patients with coeliac disease
Olén O, Bihagen E, Rasmussen F, Ludvigsson Jf
Digestive and liver disease : official journal of the Italian Society of Gastroenterology and the Italian Association for the Study of the Liver 2012;44(6):471-6

The genetic influence on diverticular disease - a twin study
Granlund J, Svensson T, Olen O, Hjern F, Pedersen Nl, Magnusson Pke, et al
ALIMENTARY PHARMACOLOGY & THERAPEUTICS 2012;35(9):1103-7

Use of antibiotics during infancy and childhood and risk of recurrent abdominal pain
Uusijarvi A, Simren M, Ludvigsson J, Wickman M, Kull I, Alm J, et al
NEUROGASTROENTEROLOGY AND MOTILITY 2012;:177-177

Use of Antibiotics During Infancy and Childhood and Risk of Recurrent Abdominal Pain
Uusijarvi A, Simren M, Ludvigsson Jf, Wickman M, Kull I, Alm Js, et al
GASTROENTEROLOGY 2012;142(5):S158-S158

Coeliac disease characteristics, compliance to a gluten free diet and risk of lymphoma by subtype
Olen O, Askling J, Ludvigsson Jf, Hildebrand H, Ekbom A, Smedby Ke
DIGESTIVE AND LIVER DISEASE 2011;43(11):862-8

Coeliac disease and body mass index: A study of two Swedish general population-based registers
Olen O, Montgomery Sm, Marcus C, Ekbom A, Ludvigsson Jf
SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY 2009;44(10):1198-206

Coeliac disease and risk of sepsis
Ludvigsson Jf, Olen O, Bell M, Ekbom A, Montgomery Sm
GUT 2008;57(8):1074-80

Increased risk of immune thrombocytopenic purpura among inpatients with coeliac disease
Olen O, Montgomery Sm, Elinder G, Ekbom A, Ludvigsson Jf
SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY 2008;43(4):416-22

Celiac disease is a risk factor for septicaemia
Ludvigsson Jf, Olen O, Olcen P, Ekbom A, Montgomery Sm
JOURNAL OF PEDIATRIC GASTROENTEROLOGY AND NUTRITION 2007;:225-225

Urinary tract infections in pregnant women with coeliac disease
Olen O, Montgomery Sm, Ekbom A, Bollgren I, Ludvigsson Jf
SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY 2007;42(2):186-93

Coeliac disease and risk of renal disease - a general population cohort study
Ludvigsson Jf, Montgomery Sm, Olen O, Ekbom A, Ludvigsson J, Fored M
NEPHROLOGY DIALYSIS TRANSPLANTATION 2006;21(7):1809-15

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