Document is current

Article History

Received: 16 April 2024

Accepted: 7 August 2025

First Online: 30 September 2025

Declarations

:

: This study was approved by the Ethics Committee of Guangzhou Medical University Affiliated Third Hospital (Approval No.: 医伦会审[2024]第074号| Medical Ethics Committee Approval No. (2024) 074; Date of Approval: April 15, 2024). All procedures complied with the Declaration of Helsinki. Informed consent exemption was granted by the ethics committee due to the retrospective nature of the study.Written informed consent was exempted by the ethics committee for the following reasons: the research involved retrospective analysis of anonymized medical records; all patient identifiers (names, ID numbers, admission dates) were permanently removed; the study protocol posed no more than minimal risk to subjects; all patients had signed broad consent forms during hospitalization permitting use of their anonymized data for research purposes.

: The author confirms: that the work described has not been published before; that it is not under consideration for publication elsewhere; that its publication has been approved by all co-authors; that its publication has been approved by the responsible authorities at the institution where the work carried out. The author agrees to publication in the Journal BMC Pregnancy and Childbirth. The authors warrants that our contribution is original and that we have full power to make this grant.

: The authors declare no competing interests.