1. Digestive Pathophysiology Unit and Digestive Endoscopy Unit; Baggiovara Hospital; Modena Italy
2. Department of Medical and Surgical Sciences; University of Bologna; Bologna Italy
3. Department of Translational Research and New Technology in Medicine and Surgery; University of Pisa; Pisa Italy
4. General and Bariatric Surgery Unit; Department of Surgery; Second University of Napoli; Naples Italy
5. Gastroenterology Unit; Department of Internal Medicine; University of Genova; Genova Italy
6. Gastroenterology Unit; Department of Surgery, Oncology and Gastroenterology; University of Padova; Padova Italy