1. Gastroenterology Unit; Epimad Registry; Amiens University Hospital; Université de Picardie Jules Verne; Amiens France
2. Department of Gastroenterology; Univerzity Karlovy; Prague Czech Republic
3. EPICOM; European Crohn & Colitis Organization; Vienna Austria
4. Public Health, Epidemiology and Economic Health; Epimad Registry; Maison Régionale de la Recherche Clinique; Centre Hospitalier Universitaire Régional; 59037 Lille Cedex France
5. Lille Inflammation Research International Center LIRIC - UMR 995 Inserm/Université Lille 2/CHRU de Lille; Equipe IBD and Environmental Factors: Epidemiology and Functional Analyses; Lille University; Lille France
6. Division of Gastroenterology; AOU Careggi Hospital; Florence Italy
7. Gastroenterology; Inserm U954; University Hospital of Nancy-Brabois; Université Henri Poincaré; Vandoeuvre-lès-Nancy France
8. 1st Department of Medicine; Semmelweis University; Budapest Hungary