Effect of low or high progesterone level in hCG day in embryo quality，and cumulative live birth rate in freeze-all strategy patients 

ZHAN Shaoquan, ZHENG Haiyan, CAO Mingzhu, LIU Jianqiao, MAO Yuling, LONG Xiaolin, LIU Hanyan.
The Journal of Practical Medicine . 2021, (13): 1690 -1694 .  DOI: 10.3969/j.issn.1006⁃5725.2021.13.009