[1] Ist Super Sanita, Natl Ctr Epidemiol Surveillance & Hlth Promot, Unit Woman Child & Adolescent Hlth, I-00161 Rome, Italy
[2] Ist Super Sanita, Natl Ctr Epidemiol Surveillance & Hlth Promot, Infect Dis Epidemiol Unit, I-00161 Rome, Italy
[3] Bambino Gesu Pediat Hosp, Med Direct, I-00165 Rome, Italy
[4] LHU Torino4, Hyg & Publ Hlth Unit, I-10015 Turin, Italy
[5] LHU Viterbo, Dept Prevent, I-01100 Viterbo, Italy
[6] ISPO Canc Res & Prevent Inst, Analyt Cytol & Biomol Unit, I-50139 Florence, Italy
[7] LHU Bologna, Dept Publ Hlth, Epidemiol Hlth Promot & Risk Commun Unit, I-40068 Bologna, Italy
[8] LHU Avezzano Sulmona LAquila, Dept Prevent, Hyg Epidemiol & Publ Hlth Unit, I-67051 Laquila, Italy
[9] LHU Teramo, San Liberatore Hosp, I-64032 Atri, Teramo, Italy
[10] LHU Torino1, Dept Prevent, Hyg & Publ Hlth Unit, I-10122 Turin, Italy
[11] LHU Pescara, Community Med Unit, I-65124 Pescara, Italy
[12] LHU Imola, Oncol Screening Ctr, I-40026 Bologna, Italy
[13] LHU Napoli 2 Nord, Mother & Child Dept, I-80010 Naples, Italy