1. Department of Surgery, Cardinal Massaia Hospital, Corso Dante Alighieri, Asti, Italy.
2. Department of Surgery, Casa di Cura Privata Pierangeli Srl, Pescara, Italy.
3. Department of Medicine DIMI, University of Genova, Genova, Italy.
4. Department of Surgical Sciences DISC, University of Genova, Genova, Italy.
5. Department of Surgical Sciences, Policlinico Umberto I University Hospital, Sapienza University of Rome, Rome, Italy.