Extended culture of day 3 embryos improves live birth rate in in vitro fertilization-embryo transfer oleh Xiao-Peng Zhao, Ling Wang, Lu Ma, Di Zuo, Fei Chang, Li-Yuan Zhang, Jun-Long Jia, Shao-Kang Mo, Yuan-Kun Sang, Bin-Bin Ma, Fang Xu, Qiang Shi