1. General Surgery Unit, Sandro Pertini Hospital - ASL Roma 2, Rome, Italy
2. Department of Surgery, Oncologic Surgery Unit, Piemonte Oncologic Foundation (FPO) IRCCS, Candiolo (TO), Italy
3. Gastrointestinal Surgery – IBD Unit, Department of Clinical and Experimental Medicine, University of Florence, Florence, Italy
4. General Surgery Unit, Santa Maria Annunziata and Serristori Hospital, Florence, Italy.