[1] IRCCS Ist Ric Farmacol Mario Negri, Dept Epidemiol, Via Giuseppe La Masa 19, I-20156 Milan, Italy
[2] Canc Prevent & Res Inst ISPO, Unit Environm & Occupat Epidemiol, Florence, Italy
[3] GIA, WIN, DOXA Inst, Milan, Italy
[4] Ist Super Sanita, Dept Therapeut Res & Med Evaluat, Rome, Italy
[5] Inst Invest Biomed Bellvitge, Inst Catala Oncol, Tobacco Control Unit, Canc Prevent & Control Program, Lhospitalet De Llobregat, Barcelona, Spain
[6] Univ Barcelona, Sch Med & Hlth Sci, Dept Clin Sci, Campus Bellvitge, Barcelona, Spain