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Chinese Acad Med Sci, Dept Obstet & Gynecol, Peking Union Med Coll Hosp, 1 Shuai Fu Yuan,Wang Fu Jing St, Beijing 100730, Peoples R China
Peking Union Med Coll, 1 Shuai Fu Yuan,Wang Fu Jing St, Beijing 100730, Peoples R China
Sun Yat Sen Univ, Affiliated Hosp 1, Dept Obstet & Gynecol, Guangzhou 510275, Guangdong, Peoples R China Chinese Acad Med Sci, Dept Obstet & Gynecol, Peking Union Med Coll Hosp, 1 Shuai Fu Yuan,Wang Fu Jing St, Beijing 100730, Peoples R China