1. Division of Internal Medicine; Hôpital de la Tour and University of Geneva; Geneva Switzerland
2. Division of Gastro-enterology and Hepatology; Geneva University Hospitals and University of Geneva; Geneva Switzerland
3. Division of Gastroenterology; McGill University Health Centre; McGill University; Montréal QC Canada
4. Division of Gastroenterology; King Khalid University Hospital; King Saud University; Riyadh Saudi Arabia
5. Division of Gastroenterology; University of Washington School of Medicine; Seattle WA USA
6. Medicine; University of Sherbrooke; Sherbrooke QC Canada