Department of Research, Fondazione IRCCS Istituto Nazionale dei Tumori di Milano, 20133 Milano, Italy. AOU Federico II, 80131 Napoli, Italy. Division of Cancer Prevention and Genetics, European Institute of Oncology IRCCS, 20141 Milano, Italy. Fondazione Edo ed Elvo Tempia ONLUS, 13900 Biella, Italy. Ats Valpadana, 46100 Mantova, Italy. Clinical Epidemiology and Cancer Registry Unit, Palermo Province Cancer Registry, Palermo University Hospital P. Giaccone, 90127 Palermo, Italy. Unit of Regional Cancer Registry, Clinical Epidemiology and Biostatistics, IRCCS-CROB, Basilicata, 85028 Rionero in Vulture, Italy. Obstetrics and Gynecology Unit, Cardinal Massaia Hospital, 14100 Asti, Italy. Associazione LUMEN, 29010 San Pietro in Cerro, Italy. Dipartimento Scienze Chirurgiche, Study University, 10124 Turin, Italy. S.C. Epidemiologia dei Tumori, AOU Città della Salute e della Scienza, CPO Piemonte, 10126 Turin, Italy.