The effect of the day 3 embryo cell number on the neonatal outcomes of day 5 single blastocyst transfer in frozen embryo transfer cycles. - Chen, Linjun; Wang, Jie; Zhu, Lihua; Xu, Zhipeng; Zhang, Ningyuan; Lin, Fei; Fang, Junshun (European Journal of Obstetrics & Gynecology & Reproductive Biology, 2023)