Wang, Nianshi
Xu, Jing
Ma, Meiyan
Shan, Linghan
Jiao, Mingli
Xia, Qi
Tian, Wanxin
Zhang, Xiyu
Liu, Limin
Hao, Yanhua
Gao, Lijun
Wu, Qunhong
Funding for this research was provided by:
National Natural Science Foundation of China (71874045, 71403073, 71333003, 71804036)
China Postdoctoral Science Foundation (2016M590296)
Heilongjiang Health and Family Planning Commission Project (2014-427)
Article History
Received: 6 March 2020
Accepted: 13 July 2020
First Online: 14 September 2020
Ethics approval and consent to participate
: Ethics approval and consent to participate is not applicable due to the retrospective nature of this study.
: All authors agree to publish.
: The authors declare that they have no competing interests.