1. Vascular Surgery and Organ Transplant Unit, Department of General Surgery and Medical-Surgical Specialties, University Hospital of Catania, 95100 Catania, Italy
2. Department of General Psychology, University of Padova, 35131 Padova, Italy
3. Dermatology Clinic, Department of General Surgery and Medical-Surgical Specialties, University Hospital of Catania, 95100 Catania, Italy
4. Department of Educational Sciences, University of Catania, 95100 Catania, Italy
5. Department of Clinical and Experimental Medicine, Institute of Psychiatry, University of Catania, 95100 Catania, Italy