1. Department of General Surgery, Singapore General Hospital, Outram Road, Singapore 169608, Singapore
2. Anesthesia and Intensive Care Unit, M. Bufalini Hospital, 47521 Cesena, Italy
3. Department of Surgery, Pavia University Hospital, 27100 Pavia, Italy
4. General, Emergency and Trauma Surgery Department, Pisa University Hospital, 56126 Pisa, Italy
5. Santa Maria Delle Croci Hospital, 48121 Ravenna, Italy
6. Department of Surgery, Macerata Hospital, Via Santa Lucia 2, 62100 Macerata, Italy
7. Department of Emergency and Trauma Surgery, M. Bufalini Hospital, 47521 Cesena, Italy
8. Department of Surgery, “Maurizio Bufalini” Hospital, 47521 Cesena, Italy