Marcello Donati1, Giovanna Brancato2, Francesco Basile1. 1. Department of Surgery and Medical-Surgical Specialties, General and Oncologic Surgery Unit, Vittorio-Emanuele University Hospital of Catania, University of Catania, Catania, Italy. 2. Department of Surgery and Medical-Surgical Specialties, Emergency Abdominal Surgery Unit, University Hospital of Catania, University of Catania, Catania, Italy.