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Authors
Zheng, Wei
Huang, Wenyu
Zhang, Li
Tian, Zhihong
Yan, Qi
Wang, Teng
Zhang, Lirui
Li, Guanghui https://orcid.org/0000-0001-6828-8774
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Funding
Funding for this research was provided by:
Beijing Natural Science Foundation Program (7184210, S160001)
‘Capital Clinical Characteristic Research’ from Beijing Science Committee (Z161100000516160)
National key research and development program (2016YFC1000304)
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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.
