[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] Ist Ric Farmacol Mario Negri, Lab Epidemiol, I-20157 Milan, Italy
[4] Univ Milan, Ist Stat Med & Biometria, I-20133 Milan, Italy