Laurent Peyrin-Biroulet1, Corinne Gower-Rousseau2,3. 1. INSERM U954 and Department of Hepatogastroenterology, Université de Lorraine, Allée du Morvan, F-54511 Vandœuvre-lès-Nancy, France peyrinbiroulet@gmail.com. 2. Public Health, Epidemiology and Economic Health, EPIMAD registry, Regional House of Clinical Research, University Hospital, 59000, Lille, France. 3. International Center of Inflammation Research LIRIC-UMR 995 INSERM/University Hospital; "IBD and Environmental Factors: Epidemiology and Functional Analyses" Group, 59000, Lille, France.