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Peking Univ, Sch Publ Hlth, Dept Epidemiol & Biostat, Beijing 100191, Peoples R China
Peking Univ, Inst Reprod & Child Hlth, Key Lab Reprod Hlth, Natl Hlth Commiss Peoples Republ China, 38 Xueyuan Rd, Beijing 100191, Peoples R China Peking Univ, Sch Publ Hlth, Dept Epidemiol & Biostat, Beijing 100191, Peoples R China