Liang, Xin
Zheng, Wei
Liu, Cheng
Zhang, Lirui
Zhang, Li
Tian, Zhihong
Li, Guanghui
Funding for this research was provided by:
Capital's Funds for Health Improvement and Research (2018-2-2112)
National Key Research and Development Program of China (2016YFC1000304)
Beijing Hospitals Authority’ Ascent Plan (DFL20191402)
Article History
Received: 18 March 2021
Accepted: 24 June 2021
First Online: 6 July 2021
Declarations
:
: The study was approved by the Ethics Committee of Beijing Obstetrics and Gynecology Hospital (2012-KY-012, 2016-KY-066). Written informed consent was obtained from all participants. All procedures were performed in compliance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.