1. Division of General, Mininvasive, Oncologic and Bariatric Surgery, Department of Advanced Medical and Surgical Sciences, University of Campania “Luigi Vanvitelli”, Via Pansini 5, 80131 Naples, Italy
2. Division of Gastroenterology, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, 56127 Pisa, Italy
3. Division of Gastroenterology, Department of Surgical, Oncological and Gastroenterological Sciences, University of Padua, 35128 Padua, Italy