[1] CHU Vaudois, Inst Univ Med Sociale & Prevent, Canc Epidemiol Unit, CH-1011 Lausanne, Switzerland
[2] CHU Vaudois, Inst Univ Med Sociale & Prevent, Canc Registry Vaud, CH-1011 Lausanne, Switzerland
[3] CHU Vaudois, Inst Univ Med Sociale & Prevent, Canc Registry Neuchatel, CH-1011 Lausanne, Switzerland
[4] European Inst Oncol, Div Epidemiol & Biostat, Milan, Italy
[5] Ist Ric Farmacol Mario Negri, Lab Epidemiol, Milan, Italy
[6] Univ Milan, Ist Stat Med & Biometria, I-20122 Milan, Italy