Zheng, Yuanyuan
Ma, Cui
Liu, Xiaowei
Wu, Shaowen
Zhang, Weiyuan http://orcid.org/0000-0003-0720-851X
Zhao, Shenglong
Funding for this research was provided by:
National Key Research and Development Program of China (2016YFC1000403)
Article History
Received: 1 April 2020
Accepted: 15 October 2020
First Online: 30 October 2020
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Review Board of Beijing Obstetrics and Gynecology Hospital. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Written informed consent was obtained from every participant.
: Not Applicable.
: The authors declare that they have no competing interests.