1. Unit of Gastroenterology and Digestive Endoscopy, AUSL Bologna Bellaria-Maggiore Hospital, Bologna, Italy
2. Unit of Gastroenterology and Digestive Endoscopy, ARNAS Garibaldi, Catania, Italy
3. Unit of Metropolitan Digestive Endoscopy, Department of Surgery, AUSL Bologna-Bellaria Hospital, Bologna, Italy
4. Unit of General Surgery, AUSL Bologna Maggiore Hospital, Bologna, Italy
5. Anesthesia and Intensive Care, IRCCS Istituto delle Scienze Neurologiche Bellaria Hospital, Bologna, Italy