目的：比较人工周期法与自然周期法准备内膜在复苏囊胚移植中的效果。
Objective: to assess the clinical outcome of frozen-thawed blastocysts transfer (FET) in natural or hormonally controlled cycles.
说明采用激光辅助打孔的方法使囊胚皱缩，结合玻璃化冻融后行囊胚移植安全有效。
The results showed that laser drilling before vitrified cryopreservation reduces blastocoelic cavity and transplantation of frozen-thawed blastocytes is safe and effective.
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