Meng, Junan
Zhu, Mengchen
Shen, Wenjuan
Huang, Xiaomin
Sun, Haixiang
Zhou, Jianjun
Funding for this research was provided by:
Chinese National Natural Science Foundation (81571504, 81771537)
Natural Science Foundation of Jiangsu Province (BK 20181117)
Article History
Received: 26 April 2019
Accepted: 30 September 2019
First Online: 8 November 2019
Ethics approval and consent to participate
: This is a retrospective cohort study that did not require informed consent, which obtained ethics board approval from the Reproductive Medical Ethics Committee of Nanjing Drum Tower Hospital. This study followed the ethical guidelines laid down in the 1975 Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.