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Peking Univ, Sch Publ Hlth, Inst Child & Adolescent Hlth, Natl Hlth Commiss Key Lab Reprod Hlth, Beijing 100191, Peoples R China
Shandong Univ, Cheeloo Coll Med, Sch Publ Hlth, Dept Epidemiol, Jinan 250012, Peoples R China Peking Univ, Sch Publ Hlth, Inst Child & Adolescent Hlth, Natl Hlth Commiss Key Lab Reprod Hlth, Beijing 100191, Peoples R China