title: On the External Validity of Epidemiologic Data from Hospital-based IBD Cohorts.
authors.affiliation: Division of Gastroenterology - Hepatology, Department of Internal Medicine, Maastricht University Medical Center, Maastricht, The Netherlands tim.vandenheuvel@maastrichtuniversity.nl.|NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, The Netherlands.
authors.forename: Tim R A
authors.initials: TR
authors.lastname: van den Heuvel
authors.affiliation: Division of Gastroenterology - Hepatology, Department of Internal Medicine, Maastricht University Medical Center, Maastricht, The Netherlands.|NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, The Netherlands.
authors.forename: Marie J
authors.initials: MJ
authors.lastname: Pierik
authors.affiliation: Division of Gastroenterology - Hepatology, Department of Internal Medicine, Maastricht University Medical Center, Maastricht, The Netherlands.|NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, The Netherlands.
authors.forename: Daisy M
authors.initials: DM
authors.lastname: Jonkers
mesh_terms: D000068598:Data Accuracy; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D015212:Inflammatory Bowel Diseases / Q000453:epidemiology* / Q000473:pathology; D015203:Reproducibility of Results