1. Department of General Surgery and Liver Transplantation, University of Bari, Bari, Italy
2. Coloproctological Unit, Galliera Hospital, Genoa, Italy
3. Section of Surgical Clinic II, Department of Surgical and Oncologic Sciences, University of Padua, Padua, Italy
4. Department of Surgical Sciences, University of Rome ‘La Sapienza’, Rome, Italy
5. Department of Emergency Surgery, ‘S. Moscati’ Hospital, Avellino, Italy