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Authors
Dai, Yan
Zhang, Jun
Liu, Rong
Xu, Na
Yan, Song-Biao
Chen, Yi
Li, Tian-He
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (81571130090)
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More Information
Article History
Received: 7 November 2019
Accepted: 16 March 2020
First Online: 25 March 2020
Compliance with ethical standards
: The protocol for this study has been approved by the Medical Ethics Committee of the Beijing Obstetrics and Gynecology Hospital, Capital Medical University (ethics number 2016-KY-059-01).
: Informed consent was obtained from all individual participants included in the study.
: The authors declare that they have no conflict of interest.
