1. Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, Section of Public Health and Human Sciences, University of Brescia, Brescia, Italy;
2. Unit of Prevention and Safety in Workplaces, Health Protection Agency of Brescia, Italy;
3. Interdisciplinary Department of Medicine, Section of Occupational Medicine “E.C. Vigliani”, University of Bari Aldo Moro, Bari, Italy;
4. Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy