1. Department of Medical Biotechnology, University of Siena, Unit of Occupational Medicine AOU Senese, Viale Bracci, Siena, Italy
2. Department of Prevention, Health and Safety Unit AUSL South-East Tuscany, Viale Cimabue, Grosseto, Italy
3. Department of Prevention, Unit of Occupational Hygiene and Toxicology, Laboratory of Public Health AUSL South-East Tuscany, Strada del Ruffolo, Siena, Italy
4. Sias s.r.l., Via Carabioli 6/8 Cellatica, Brescia, Italy
5. Department of Economics and Statistics, University of Siena, Piazza San Francesco 7, 53100 Siena, Italy