Patients received FET cycle were treated with GnRH-a and hormone replacement therapy (HRT) before embryos transfer. Leuprorelin Acetate Microspheres for Injection (Enantone, Takeda, Japan) was intramuscularly injected on the day 2 of menstruation cycle with a dose of 3.75 mg. Estradiol valerate (Bugale, Bayer, Germany) were administered with a started dose of 4–6 mg/d after 28 days. When the endometrial thickness reached 7 mm, intramuscular injection of progesterone oil (Xianju Pharmaceutical, Zhejiang, China) 40 mg/d was provided for luteal support, after 4 or 6 days, the cleavage-stage embryos or blastocysts were transfrred.
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