1. Interdisciplinary Department of Medicine, Section of Occupational Medicine “E.C. Vigliani”, University of Bari Aldo Moro, Bari, Italy;
2. Department of Medical and Surgical Specialties, Radiological Sciences and Public Health Section of Public Health and Human Sciences, University of Brescia, Brescia, Italy;
3. Department of Medical and Surgical Science, Section of Public Health and Human Sciences, University of Bologna, Bologna, Italy;
4. Department of Medicine and Surgery, Laboratory of Industrial Toxicology, University of Parma, Parma, Italy