[1] Peking Univ, Hlth Sci Ctr, George Inst Global Hlth, Beijing 100871, Peoples R China
[2] Jishuitan Hosp, Beijing, Peoples R China
[3] Univ Oxford, Nuffield Dept Populat Hlth, George Inst Global Hlth, Oxford, England
[4] Univ Oxford, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Kadoorie Res Ctr, Oxford, England
[5] Univ Sydney, Sydney Med Sch, George Inst Global Hlth, Sydney, NSW 2006, Australia
[6] Univ Oxford, Oxford Martin Sch, 34 Broad St, Oxford OX1 3BD, England