Document is current
Any future updates will be listed below
-
Authors
Xu, Yanyan
Xu, Qiaoyu
Ma, Yanhui
Duan, Jianghui
Zhang, Haibo
Liu, Tongxi
Li, Lu
Sun, Hongliang https://orcid.org/0000-0001-5757-752X
Shi, Kaining
Xie, Sheng
Wang, Wu
-
Funding
Funding for this research was provided by:
Beijing Municipal Science & Technology Commission (Z181100001718099)
National Natural Science Foundation of China (81501469)
National health and family planning commission public service (201402019)
- License Information
-
More Information
Article History
Received: 22 July 2019
Accepted: 6 November 2019
First Online: 14 November 2019
Ethics approval and consent to participate
: This study was approved by our institutional ethics committee. For this type of retrospective study, formal consent was not required. The study was performed in accordance with the relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.
