An endometrial receptivity scoring system evaluated by ultrasonography in patients undergoing frozen–thawed embryo transfer: a prospective cohort study by Yan Ouyang, Yan Ouyang, Yangqin Peng, Yangqin Peng, Yuyao Mao, Yuyao Mao, Mingxiang Zheng, Mingxiang Zheng, Fei Gong, Fei Gong, Fei Gong, Yuan Li, Yuan Li, Xihong Li, Xihong Li

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