1. Department of Medicine and Gastroenterology, SE Trust, Belfast N. Ireland, UK
2. Public Health Unit, Epimad Registry, Maison Régionale de la Recherche Clinique, Lille University Hospital, France INSERM UMR 995, LIRIC, Team 5: From epidemiology to functional analysis, Lille University, France
3. Department of Gastroenterology, IBD Center, Istituto Clinico Humanitas, Humanitas University, Milan, Italy
4. INSERM U954 and Department of Hepatogastroenterology, Nancy University Hospital, Lorraine University, Allée du Morvan, F-54511 Vandoeuvre-lès-Nancy, France