Division of Gastroenterology, Department of Translational Research and New Technology in Medicine and Surgery, University of Pisa, Pisa, Italy. Division of Gastroenterology, Washington University School of Medicine, St. Louis, Missouri, USA. Digestive Physiology, Hospices Civils de Lyon, and Lyon I University, Lyon, France. Division of General, Mininvasive and Bariatric Surgery, Department of Surgery, University of Campania "Luigi Vanvitelli," Naples, Italy. Wingate Institute of Neurogastroenterology, Blizard Institute, Barts and The London School of Medicine and Dentistry, QMUL, London, UK. Division of Gastroenterology, University Clinics for Visceral Surgery and Medicine, Bern University Hospital, Bern, Switzerland. Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy. Gastroenterology and Endoscopy Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy. Division of Gastroenterology, Department of Medicine, Northwestern University, Chicago, Illinois, USA. Division of Gastroenterology, Department of Surgical, Oncological and Gastroenterological Sciences, University of Padua, Padua, Italy.