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Authors
Dai, Yan
Li, Tian-He
He, Xin
Yan, Song-Biao
Gao, Yan
Chen, Yi
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Article History
Received: 8 June 2020
Accepted: 7 December 2020
First Online: 11 January 2021
Compliance with Ethical Standards
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: The authors declare that they have no conflict of interest.
: 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.
