1. University of Bologna; Department of Medical and Surgical Sciences; UO Medicina del Lavoro - Policlinico Sant'Orsola-Malpighi Via Palagi 9 Bologna Italy 40138
2. Regione Toscana; CeRIMP - Centro Regionale Infortuni e Malattie Professionali; via di S.Salvi, 12 Palazzina 14 Firenze Italy 50135
3. University of Bologna; Section of Occupational Medicine, Department of Internal Medicine, Geriatrics and Nephrology; UO Medicina del Lavoro - Policlinico Sant'Orsola Malpighi Via Palagi 9 Bologna Italy 40138
4. Policlinico Sant'Orsola-Malpighi; Unità Operativa Medicina del Lavoro; Via Palagi 9 Bologna Italy 40138
5. Coronel Institute of Occupational Health, Academic Medical Center; Netherlands Center of Occupational Diseases; PO Box 22660 Amsterdam Netherlands 1100 DD
6. Harvard School of Public Health; Environmental Health; 665 Huntington Avenue, Building I Room 1407 Boston Massachusetts USA 02115