1 Department of Surgical Sciences, Organs Transplantation and Advanced Technologies, "G.F. Ingrassia" University of Catania, Cannizzaro Hospital, Via Messina 829, 95126, Catania, Italy. idicarlo@unict.it.
2 Department of Surgery, Patti Hospital (ME), Patti, Italy.
3 Hepatology Unit, Department of Medical and Pediatric Sciences, University of Catania, Catania, Italy.