845
Participants
Start Date
August 30, 2022
Primary Completion Date
October 8, 2024
Study Completion Date
November 24, 2024
the timing of embryo transfer in freeze-all cycles
"Immediate FET group Freeze-all embryo transfer will be carried out in the menstrual cycle immediately following oocyte retrieval.~Postponed FET group Freeze-all embryo transfer will be carried out during the second menstrual cycle to 6 months after oocyte retrieval."
Peking university third hospital, Beijing
Women's Hospital School Of Medicine Zhejiang University
OTHER
The Affiliated Hospital Of Guizhou Medical University
OTHER
Shengjing Hospital
OTHER
Peking University Third Hospital
OTHER