[1] Univ Tasmania, Inst Med Res, Hobart, Tas, Australia
[2] Monash Univ, Dept Epidemiol & Prevent Med, Melbourne, Vic, Australia
[3] Univ Sydney, Inst Bone & Joint Res, Sydney, NSW, Australia
[4] Univ Oxford, Nuffield Dept Obstet & Gynaecol, George Inst Global Hlth, Oxford, England
[5] Southern Med Univ, Zhujiang Hosp, Clin Res Ctr, Guangzhou, Guangdong, Peoples R China