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Authors
Liu, Tingting
Zhang, He
Han, Chao
Kong, Weimin
- License Information
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Article History
Received: 12 June 2023
Accepted: 9 July 2023
First Online: 12 August 2023
Declarations
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: The authors declare that they have no competing interests. Dr. Tingting Liu, He Zhang, Chao Han and Weimin Kong have no conflicts of interest or financial ties to disclose.
: This is an observational study. The ethics committee of the Beijing Obstetrics and Gynecology Hospital, Capital Medical University has confirmed that no ethical approval is required.
