[1] CNR, Inst Clin Physiol, I-56126 Pisa, Italy
[2] CNR, Inst Biomed Res & Innovat, I-90146 Palermo, Italy
[3] Italian Workers Compensat Author INAIL, Dept Hyg & Epidemiol, Occupat & Environm Med, I-00144 Rome, Italy
[4] Lazio Reg Hlth Serv ASL Roma 1, Dept Epidemiol, I-00147 Rome, Italy