1. Occupational Medicine, Department of Clinical and Experimental Medicine, University of Catania, 95124 Catania, Italy.
2. Mediterranean Oncology Institute, Viagrande, Italy
3. Cannizzaro Hospital, Catania, 95123, Italy.
4. Departmente of Medicine and Surgery, University of Enna "Kore", Piazza dell'Università, 94100 Enna EN