1Surgical Emergency Unit, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
2Digestive and Emergency Surgery Unit, Azienda Ospedaliera “S.Maria”, “S.Maria” Hospital, Terni, Italy
3Department of General Surgery, Causa Pia Luvini Hospital, Cittiglio, Italy
4Department of Anaesthesia and Intensive Care, “M. Bufalini” Hospital, Cesena, Italy
5Department of General Surgery, “S. Pertini” Hospital, Rome, Italy
6Department of General Surgery, Madonna del Soccorso Hospital, S.Benedetto del Tronto, Italy
7Department of Oncologic Surgery, “A. Businco” Hospital, Cagliari, Italy
8Department of General and Emergency Surgery, “M. Bufalini” Hospital, Cesena, Italy
9Department of General Surgery, S.Maria Annunziata Hospital, Florence, Italy
10Department of General and Emergency Surgery, S.Camillo-Forlanini Hospital, Rome, Italy