1. Abdominal Surgery Casa sollievo della Sofferenza, San Giovanni Rotondo, Italy
2. Department of General Surgery, Maggiore Hospital Carlo Alberto Pizzardi, Bologna, Italy
3. Department of Surgery, Ospedale Madonna del Soccorso, San Benedetto del Tronto, Italy
4. Department of Anesthesia, Intensive Care and Prehospital Emergency, Maggiore Hospital Carlo Alberto Pizzardi, Bologna, Italy
5. Department of General Surgery, Royal Perth Hospital, Perth, Western Australia, Australia
6. Department of Trauma Surgery Unit - Maggiore Hospital AUSL, Bologna, Italy