Wang, Sha
Duan, Hua http://orcid.org/0000-0002-5123-5147
Li, Bohan
Hong, Wei
Li, Xiao
Wang, Yiyi
Guo, Zheng Chen
Funding for this research was provided by:
National Natural Foundation of China (81571412)
Article History
Received: 5 August 2021
Accepted: 20 February 2022
First Online: 17 March 2022
Declarations
:
: We confirm that the study was approved by the local research and ethics committee of Beijing Obstetrics and Gynaecology Hospital (No. 2016-KY-01) and certify that the study was performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: No objection.
: The authors declare that there are no conflicts of interest regarding the publication of this article.