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Authors
Dong, Ying
Zhai, Yanhong
Wang, Jing
Chen, Yi
Xie, Xin
Zhang, Chunhong
Liu, Jingrui
Lu, Yifan
Tang, Guodong
Han, Lican
Li, Lin
Cao, Zheng https://orcid.org/0000-0002-0968-1864
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (81702057)
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Article History
Received: 21 November 2019
Accepted: 24 December 2019
First Online: 3 January 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Beijing Obstetrics and Gynecology Hospital, Capital Medical University (approval number: 2017-KY-070-01). The verbal consents from the participants were required as no clinical intervention was involved, which was approved by the ethical committee of our institute.
: Not applicable.
: The authors declare that they have no competing interests.
