1. Department of Health Sciences (DISSAL), Postgraduate School of Occupational Medicine, University of Genoa, Genoa, Italy
2. Occupational Medicine Unit, Ospedale Policlinico San Martino, Genoa, Italy
3. Department of Health Sciences (DISSAL), Postgraduate School of Public Health, University of Genoa, Genoa, Italy
4. Hygiene Unit, Ospedale Policlinico San Martino, Genoa, Italy