1. HPB Surgery Unit, Pineta Grande Hospital, Castel Volturno, 81030 Caserta, Italy
2. Department of Clinical Medicine and Surgery, University of Naples “Federico II”, 80131 Naples, Italy
3. Department of Medicine and Health Sciences “V. Tiberio”, University of Molise, 86100 Campobasso, Italy
4. Gastroenterology Unit, A. Cardarelli Hospital, 86100 Campobasso, Italy