1. Occupational Medicine, Department of Clinical and Experimental Medicine, University of Catania, 95124 Catania, Italy
2. Anatomic Pathology, Department of Medical and Surgical Sciences and Advanced Technologies, G.F. Ingrassia, University of Catania, 95124 Catania, Italy
3. Anatomy and Histology, Department of Biomedical Sciences and Biotechnologies, University of Catania, 95124 Catania, Italy