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Chongqing Med Univ, Affiliated Hosp 1, Dept Obstet, Chongqing 400016, Peoples R China
Chongqing Med Univ, Affiliated Hosp 1, Dept Reprod Hlth & Infertil, Chongqing 400016, Peoples R China
Chongqing Med Univ, Canada China New Zealand Joint Lab Maternal & Fet, Chongqing 400016, Peoples R China Chongqing Med Univ, Sch Publ Hlth & Management, 1 Yixueyuan Rd, Chongqing 400016, Peoples R China