This was a retrospective, single-center cohort study that included all women without a fresh embryo transplant in our center who underwent their first resuscitation cycle blastocyst transfer from October 2018 to October 2021. A total of 5477 cycles were enrolled in the study after excluding patients with various uterine malformations, adenomyosis, severe endometriosis, recurrent miscarriages, and preimplantation genetic diagnoses of the blastocyst.
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