Affiliation: | 1. Digestive Endoscopy Unit, Istituto Clinico Humanitas, , Milano, Italy;2. Surgical Endoscopy Unit, Presidio Spedali Civili, , Brescia, Italy;3. Gastroenterology Unit, Azienda Ospedaliera Universitaria Careggi, , Firenze, Italy;4. Department of Gastroenterology, IRCCS Casa Sollievo della Sofferenza, , San Giovanni Rotondo, Italy;5. Gastroenterology and Digestive Endoscopy Unit, Nuovo Regina Margherita, , Roma, Italy |