1. General Surgery Unit, University Hospital of Catania, Catania 95123, Italy
2. Pathology Unit, Department of Medical and Surgical Sciences and Advanced Technologies, University of Catania, Catania 95123, Italy
3. Organ Transplant Unit, University Hospital of Catania, Catania 95123, Italy
4. Department of Biomedical and Biotechnological Sciences, University of Catania, Catania 95123, Italy
5. Gastroenterology Unit, University Hospital of Catania, Catania 95123, Italy