[1] Univ Milan, Dept Clin Sci & Community Hlth, Milan, Italy
[2] Univ Lausanne, Ctr Primary Care & Publ Hlth Unisante, Dept Epidemiol & Hlth Serv Res, Lausanne, Switzerland
[3] NCI, Div Canc Epidemiol & Genet, NIH, Rockville, MD USA
[4] SUNY Stony Brook, Stony Brook Canc Ctr, Dept Family Populat & Prevent Med, Stony Brook, NY USA
[5] Univ Bologna, Dept Med & Surg Sci, Bologna, Italy
[6] Univ Milan, Dept Clin Sci & Community Hlth, Via Celoria 22, I-20133 Milan, Italy