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Peking Univ, Hlth Sci Ctr, Minist Hlth, Inst Reprod & Child Hlth,Key Lab Reprod Hlth, 38 Xueyuan Rd, Beijing 100191, Peoples R China
Peking Univ, Hlth Sci Ctr, Sch Publ Hlth, Dept Epidemiol & Biostat, Beijing, Peoples R China
Peking Univ, Hlth Sci Ctr, Sch Publ Hlth, Off Natl Maternal & Child Hlth Stat China, Beijing, Peoples R China Peking Univ, Hlth Sci Ctr, Minist Hlth, Inst Reprod & Child Hlth,Key Lab Reprod Hlth, 38 Xueyuan Rd, Beijing 100191, Peoples R China