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Article History

Received: 7 February 2025

Accepted: 23 May 2025

First Online: 28 May 2025

Declarations

:

: This study was reviewed and approved by Ethics Committee of Shandong Provincial Maternal and Child Health Care Hospital Affiliated to Qingdao University, with the approval number:2024 − 105. Informed consent was waived by Ethics Committee of Shandong Provincial Maternal and Child Health Care Hospital Affiliated to Qingdao University for this study because this was a retrospective study and the data are anonymous. All methods were carried out in accordance with the Declaration of Helsinki, relevant guidelines and regulations.

: Not applicable.

: The authors declare no competing interests.