Humanitas University, Milan, Italy. Centre Hospitalier Universitaire Hotel Dieu, Nantes, France. Department of Gastroenterology and Hepatology, Veterans Affairs Medical Center, Kansas City, MO, USA; Department of Gastroenterology and Hepatology, University of Kansas Medical Center, Kansas City, KS, USA. Fondazione Policlinico Universitario A. Gemelli, Rome, Italy. Western General Hospital, Edinburgh, UK. Klinikum Forchheim, Forchheim, Germany. Hospital de Sant Joan Despí Moisès Broggi, Sant Joan Despí, Spain; Endos Medicina, Barcelona, Spain. Division of Gastroenterology, University of Alberta, Edmonton, Alberta, Canada. Electronic address: baumgart@ualberta.ca.