[1] Peking Univ, Natl Hlth Commiss Key Lab Reprod Hlth, Inst Child & Adolescent Hlth, Sch Publ Hlth, Beijing, Peoples R China
[2] Monash Univ, Sch Publ Hlth & Prevent Med, Dept Epidemiol & Prevent Med, Melbourne, Vic, Australia
[3] Natl Hlth Commiss China, Dept Informat & Stat, Beijing, Peoples R China
[4] UNICEF China Off, Hlth Nutr & WASH Sect, Beijing, Peoples R China
[5] Univ Melbourne, Fac Med Dent & Hlth Sci, Dept Paediat, Parkville, Vic, Australia
[6] Murdoch Childrens Res Inst, Parkville, Vic, Australia
[7] Royal Childrens Hosp, Ctr Adolescent Hlth, Parkville, Vic, Australia