1. Department of Social Medicine, Section of Occupational Medicine, Messina University, Messina, Italy
2. Operative Unit of Pneumology, AOU (Concern Hospital University) Polyclinic G. Martino, Messina, Italy
3. Operative Unit of Pathology and Ultrastructural Diagnostics, AOU (Concern Hospital University) Polyclinic G. Martino, Messina, Italy
4. Interdepartmental Centre of Experimental, Environmental and Occupational Toxicology, University of Messina, Messina, Italy