1. Gastrointestinal Unit, Department of Surgery, Oncology and Gastroenterology, University of Padua , Padua, Italy
2. Gastrointestinal Unit, Department of Internal Medicine and Medical Specialties, University of Genoa , Genoa, Italy
3. Digestive Pathophysiology Unit, Baggiovara Hospital , Modena, Italy
4. Department of Translational Research and New Technology in Medicine and Surgery, University of Pisa , Pisa, Italy
5. General and Bariatric Surgery Unit, Department of Surgery, Second University of Napoli , Napoli, Italy