Zheng, Wei
Huang, Wenyu
Zhang, Li
Tian, Zhihong
Yan, Qi
Wang, Teng
Zhang, Lirui
Li, Guanghui https://orcid.org/0000-0001-6828-8774
Funding for this research was provided by:
Beijing Natural Science Foundation Program (7184210)
Beijing Natural Science Foundation Program (S160001)
‘Capital Clinical Characteristic Research’ from Beijing Science Committee (Z161100000516160)
National key research and development program (2016YFC1000304)
Article History
Received: 23 June 2019
Accepted: 13 August 2019
First Online: 23 August 2019
Ethics approval and consent to participate
: 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.