1. Interinstitutional Epidemiology Unit, AUSL (Azienda Unità Sanitaria Locale) Reggio Emilia, Reggio Emilia, Italy2Arcispedale S. Maria Nuova, IRCCS (Istituto di Ricovero e Cura a Carattere Scientifico), Reggio Emilia, Italy
2. Unit of Cancer Epidemiology and Belgian Cancer Centre, Scientific Institute of Public Health, Brussels, Belgium
3. Department of Pathology, Vrije Universiteit Medical Center, Amsterdam, the Netherlands