[1] Univ Milan, Dept Clin Sci & Community Hlth, Via Giovanni Celoria 22, I-20133 Milan, Italy
[2] IRCCS Fdn G Pascale, Ist Nazl Tumori, Epidemiol & Biostat Unit, Naples, Italy
[3] IRCCS, Ctr Riferimento Oncol CRO, Unit Canc Epidemiol, Aviano, Italy
[4] Univ Bologna, Dept Med & Surg Sci, Bologna, Italy