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Chongqing Med Univ, Dept Obstet & Gynecol, Women & Childrens Hosp, Chongqing 401147, Peoples R China
Chongqing Hlth Ctr Women & Children, Dept Obstet & Gynecol, Chongqing 401147, Peoples R China
Chongqing Med Univ, State Key Lab Maternal & Fetal Med Chongqing Munic, Affiliated Hosp 1, Chongqing 400016, Peoples R China Chongqing Med Univ, Dept Obstet & Gynecol, Women & Childrens Hosp, Chongqing 401147, Peoples R China