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Authors
Zhao, Zhekun
Zhou, Qiongjie
Li, Xiaotian
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Article History
Received: 10 November 2020
Accepted: 4 May 2021
First Online: 24 May 2021
Declarations
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: The institutional review board of the Obstetrics and Gynecology Hospital of Fudan University approved this study (IRB2020–147). All the procedures were performed in accordance with the ethical standards of the institutional research committee and the 1964 Helsinki declaration and its later amendments.Informed consent was obtained from all the individual participants included in the study.
: Not applicable.
: All authors declare that they have no competing interests.
