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. Baggiovara Hospital, Modena, Italy
4. Gastrointestinal Unit, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
5. Surgery Unit, Department of Surgery, University of Campania Luigi Vanvitelli, Caserta, Italy
6. Department of Surgical Science and Integrated Diagnostics, University of Genoa, Genoa, Italy