1. Unit of Medical Statistics and Cancer Epidemiology, CPO Piemonte and University of Eastern Piedmont, Novara, Italy
2. Interdepartmental Centre G. Scansetti, University of Turin for Studies on Asbestos and other Toxic Particulates, Turin, Italy
3. Unit of Cancer Epidemiology, CPO Piemonte, CeRMS (Centro Ricerca Medicina Sperimentale) and University of Turin, Turin, Italy