[1] London Sch Hyg & Trop Med, Dept Publ Hlth Environm & Soc, Keppel St, London WC1E 7HT, England
[2] Catalan Inst Oncol, Canc Epidemiol Res Program, Av Gran Via 199-203, Barcelona 08908, Spain
[3] Bellvitge Biomed Res Inst IDIBELL, Av Gran Via 199-203, Barcelona 08908, Spain
[4] Carlos III Inst Hlth, Consortium Biomed Res Epidemiol & Publ Hlth CIBERE, Av De Monforte de Lemos 5, Madrid 28029, Spain
[5] Univ Barcelona, Fac Med, C Casanova 143, Barcelona 08036, Spain
[6] Drassanes Vall dHebron Ctr Int Hlth & Infect Dis, Community & Publ Hlth Team ESPIC, Carrer St Oleguer 17, Barcelona 08001, Spain