[1] Univ Turin, Citta Salute & Sci Univ Hosp, Dept Med Sci, Canc Epidemiol Unit,CPO Piedmt, I-10124 Turin, Italy
[2] INSERM, U707, Epidemiol Allerg & Resp Dis EPAR Dept, Paris, France
[3] UPMC, Univ Paris 04, EPAR UMR S 707, Med Sch St Antoine, Paris, France
[4] Univ Porto, Sch Med, Dept Clin Epidemiol Predict Med & Publ Hlth, P-4100 Porto, Portugal
[5] Inst Publ Hlth, EPIUnit, Porto, Portugal
[6] CIBERESP, Subdirecc Salud Publ Gipuzkoa, Dept Sanidad Gobierno Vasco, Biodonostia,Donostia Ospitalea, Donostia San Sebastian, Basque Country, Spain
[7] Erasmus MC, Dept Epidemiol, Generat R Study, Rotterdam, Netherlands
[8] Erasmus MC, Dept Pediat, Div Resp Med & Neonatol, Rotterdam, Netherlands
[9] Univ Valencia, E-46003 Valencia, Spain
[10] CIBERESP, Valencia, Spain
[11] FISABIO, Fdn Promot Hlth & Biomed Res Valencian Reg, Valencia, Spain
[12] Univ Bologna Alma Mater Studiorum, Dept Biomed & Neuromotor Sci, Bologna, Italy
[13] Lazio Reg Hlth Serv, Dept Epidemiol, Rome, Italy
[14] Ctr Res Environm Epidemiol CREAL, Barcelona, Spain
[15] Hosp del Mar, Res Inst, IMIM, Barcelona, Spain
[16] Spanish Consortium Res Epidemiol CIBERESP, Barcelona, Spain
[17] Univ Southampton, Southampton Gen Hosp, MRC Lifecourse Epidemiol Unit, Southampton, Hants, England
[18] Univ Copenhagen, Dept Publ Hlth, Sect Social Med, Copenhagen, Denmark
[19] Maastricht Univ Med Ctr, CAPHRI Sch Publ Hlth & Primary Care, Dept Epidemiol, Maastricht, Netherlands
[20] Maastricht Univ, Med Ctr, NUTRIM Sch Nutr Toxicol & Metab, Dept Med Microbiol, NL-6200 MD Maastricht, Netherlands
[21] Faroese Hosp Syst, Dept Occupat Med & Publ Hlth, Torshavn, Faroe Islands, Denmark
[22] Univ Southampton, Fac Med, Clin & Expt Sci Acad Unit, Southampton SO9 5NH, Hants, England
[23] IB SALUT, Area Salud Menorca, Menorca, Spain
[24] Meyer Childrens Univ Hosp, Epidemiol Unit, Florence, Italy