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XU Hong-mei; ZHANG Na-wei; ZHANG Zhen-yu; LI Shu-hong; SHI Xiu-ting; LIU Chong-dong;
Department of Obstetrics and Gynecology Fengtai Hospital Capital Medical University Beijing 100020 China;
Department of Obstetrics and Gynecology Chaoyang Hospital Capital Medical University Beijing 100020 China;
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