1. Department of Internal Medicine, University of Genoa, Genoa, Italy
2. Department of Surgery, University of Campania “Luigi Vanvitelli”, Naples, Italy
3. Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
4. Department of Gastroenterology, Gastroenterology Digestive Pathophysiology Unit, Baggiovara Hospital, Modena, Italy
5. Department of Surgery, Oncology and Gastroenterology, University of Padua, Padua, Italy