1. Division of Gastroenterology; Ulster Hospital; Belfast UK
2. Gastroenterology Section; Department of Internal Medicine; Centro de Educación Médica e Investigaciones Clínicas (CEMIC); Buenos Aires Argentina
3. Leeds Institute of Rheumatic and Musculoskeletal Medicine; Leeds Teaching Hospitals NHS Trust; Leeds UK
4. UMR 7365 IMoPA CNRS-Université de Lorraine; Biopôle de l'Université de Lorraine; Campus Biologie-Santé; Vandœuvre-lès-Nancy Cedex France
5. Department of Gastroenterology; IBD Center; Istituto Clinico Humanitas; Humanitas University; Milan Italy
6. Western University; London ON Canada
7. Division of Gastroenterology; University of California San Diego; La Jolla CA USA
8. Inserm U954 and Department of Hepato-Gastroenterology; University Hospital of Nancy; Lorraine University; Vandoeuvre-les-Nancy France