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Authors
Wang, Jingxue
Liu, Qiwei
Deng, Boer
Chen, Fang
Liu, Xiaowei
Cheng, Jiumei https://orcid.org/0000-0001-8799-1887
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Article History
Received: 28 July 2019
Accepted: 9 December 2020
First Online: 9 January 2021
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were approved by the local institutional ethics committee of the Beijing Obstetrics and Gynecology Hospital committee (ethics approval number: 2019-KY-024-01). Due to the retrospective study design, consent for participation was not required. Nevertheless, private information was well-protected during the study.
: Not applicable.
: The authors declare no conflicts of interest.
