1. Department of Pathophysiology and Transplantation, Università degli Studi di Milano - Italy; Gastroenterology and Endoscopy Unit, Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico; Milan Italy
2. Division of Gastroenterology; Department of Surgery, Oncology and Gastroenterology; University of Padua; Padua Italy
3. Division of Gastroenterology; Department of Translational Research and New Technology in Medicine and Surgery; University of Pisa; Cisanello Hospital; Pisa Italy
4. Division of General and Bariatric Surgery; Department of Surgery; Second University of Naples; Naples Italy
5. Division of Gastroenterology; Washington University School of Medicine; St. Louis Missouri