1. Section of General Surgery and Oncology, Department of General Surgery, University Medical School of Catania, Catania, Italy.
2. Department “G.F. Ingrassia” Section of Hygiene and Public Health, University of Catania, Catania, Italy.
3. Section of Biochemistry, Department of Drug Sciences, University of Catania, Catania, Italy.
4. Mediterranean Institute for Transplantation and Advanced Specialized Therapies, University of Pittsburgh Medical Center in Italy, Palermo, Italy.