1. Department of General, Emergency, and Trauma Surgery, M. Bufalini Hospital, 47521 Cesena, Italy
2. Department of General, Emergency and Trauma Surgery, University Hospital of Pisa, 56124 Pisa, Italy
3. Department of General, Emergency and Trauma Surgery, IRCCS Policlinico San Matteo Foundation, University of Pavia, 27100 Pavia, Italy
4. Department of Surgery, Macerata Hospital, 62100 Macerata, Italy