1. Center of Molecular and Genetic Epidemiology, Department of Clinical Sciences and Community Health Università degli Studi di Milano Milan Italy
2. Epidemiology Unit, Fondazione Cà Granda IRCCS Ospedale Maggiore Policlinico Milan Italy
3. Exposure, Epidemiology and Risk Program, Department of Environmental Health Harvard School of Public Health Boston MA USA
4. Department of Clinical and Experimental Medicine University of Insubria Varese Italy
5. Occupational Medicine and Industrial Hygiene, Department of Experimental and Applied Medicine University of Brescia Brescia Italy