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Peking Univ Third Hosp, Dept Obstet & Gynecol, 49 North Garden Rd, Beijing 100191, Peoples R China
Peking Univ Third Hosp, Natl Clin Res Ctr Obstet & Gynecol, 49 North Garden Rd, Beijing 100191, Peoples R China
Peking Univ, Dept Maternal & Child Hlth, Sch Publ Hlth, 38 Xueyuan Rd, Beijing 100191, Peoples R China Peking Univ Third Hosp, Dept Obstet & Gynecol, 49 North Garden Rd, Beijing 100191, Peoples R China