1. Department of Surgery, Patti Hospital (ME), Patti, Italy.
2. Hepatology Unit, Department of Medical and Pediatric Sciences, University of Catania, Catania, Italy.
3. Department of Surgical Sciences and Advanced Technologies "G.F. Ingrassia", University of Catania, Catania, Italy.
4. Department of General Surgery, Hamad General Hospital, Doha, Qatar.