1. Department of Biosciences, Tecnopolo di Castel Romano, Rome, Italy.
2. Department of Emergency Surgery, Ospedale S. Camillo, Rome, Italy.
3. Department of Emergency Surgery, Policlinico Umberto I, “Sapienza” University of Rome, Rome, Italy.
4. Department of General Surgery, Ospedale Vannini, Rome, Italy.
5. Department of General Surgery, Ospedale Sandro Pertini, Rome, Italy.
6. Department of General Surgery, Ospedale Regina Apostolorum, Albano, Italy.
7. Department of General Surgery, Ospedale S. Maria Goretti, Latina, Italy.