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Peking Univ, Hlth Sci Ctr, Sch Publ Hlth,Inst Reprod & Child Hlth, Minist Hlth,Key Lab Reprod Hlth, Beijing 100191, Peoples R China
Peking Univ, Hlth Sci Ctr, Sch Publ Hlth, Dept Epidemiol & Biostat, Beijing 100191, Peoples R China Peking Univ, Hlth Sci Ctr, Sch Publ Hlth,Inst Reprod & Child Hlth, Minist Hlth,Key Lab Reprod Hlth, Beijing 100191, Peoples R China