Effect of Estrogen Starting Time on the Outcome of Frozen-Thawed Embryo Transfer in Hormone Replacement Treatment after GnRHa Down Regulation

XING Ya-chun, SU Yan, ZHAO Chun, LI Xin, LING Xiu-feng

Journal of International Reproductive Health/Family Planning . 2021, (2): 89 -92 . DOI: 10.12280/gjszjk.20200355