1. Cancer Epidemiology Unit, CeRMS and CPO Piemonte, University of Turin, Turin, Italy
2. Unit of Medical Statistics and Epidemiology, Department of Medical Sciences, University of Eastern Piedmont and CPO Piemonte, Novara, Italy
3. Interdepartmental Center ‘G. Scansetti’ for the Study of Asbestos and other Toxic Particulates, University of Turin, Turin, Italy
4. Medical Statistics Unit, Department of Public Health and Microbiology, University of Turin, Turin, Italy
5. Department of Statistics ‘G. Parenti’, University of Florence, Florence, Italy; Department of Statistics, Biostatistics Unit, Institute for Cancer Prevention (CSPO), Florence, Italy