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Article History

Received: 31 August 2023

Accepted: 22 March 2024

First Online: 4 April 2024

Declarations

:

: This study was approved by the Ethics Committee of the Maternity Hospital of Nanjing Medical University(NO.2023KY-0056). This study was conducted in accordance with the Declaration of Helsinki, and the rights and privacy of all subjects were protected. As this was a retrospective study, the Ethics Committee of Nanjing Medical University waived informed consent for this study.

: The lead author confirms that the paper has not been published before; that it is not under consideration for publication elsewhere; that its publication has been approved by all co-authors; and that its publication has been approved (tacitly or explicitly) by the responsible authorities at the institution where the work is carried out. The lead author transfers to the founder of the journal the exclusive right to the presented paper, including the right to publish the paper in the English language. The copyright is transferred when the article is accepted for publication. The copyright transfer covers the exclusive right to reproduce and distribute the article, including reprints, translations, photographic reproductions, microform, electronic form, or any other reproductions of similar nature.

: The authors declare that they have no competing interests.