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Authors
Wang, Kai https://orcid.org/0000-0002-0316-2975
Chen, Yaxia https://orcid.org/0000-0001-8276-7544
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Article History
Received: 21 July 2020
Accepted: 8 November 2020
First Online: 20 November 2020
Compliance with ethical standards
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: The authors report no conflict of interest.
: The approval for this study was provided by the ethical committee of Zhejiang University School of Medicine Women’s Hospital, Hangzhou, China. Owing to the retrospective study design and analysis of clinical data, written informed consent was formally waived.
