1. Gastroenterology and Endoscopy Unit, IRCCS Humanitas Research Hospital, Milan
2. Gastroenterology Unit, ‘Nuovo Regina Margherita’ Hospital, Rome
3. Department of Biomedical Sciences, Humanitas University, Milan
4. Gastroenteorology Unit, ‘Versilia’ Hospital, Lido di Camaiore
5. Gastroenterology Unit, ‘Riuniti’ Hospital, Foggia, Italy