1. Interdisciplinary Department of Medicine, Section of Occupational Medicine “E.C. Vigliani”, Università di Bari Aldo Moro, Bari, Italy
2. Department of Prevention, SPESAL ASL Lecce, Lecce, Italy
3. Department of Experimental and Applied Medicine, Section of Occupational Medicine and Industrial Hygiene, University of Brescia, Brescia, Italy