Chen, Xu
Zhang, Yitao
Tang, Yijia
Sun, Xun
Tong, Jiao http://orcid.org/0000-0002-5080-3181
Yan, Dongmei
Article History
Received: 6 April 2023
Accepted: 16 July 2023
First Online: 3 August 2023
Declarations
:
: The study was approved by the Research Ethics Committee of Lianyungang Maternal and Child Health Hospital (LW2022017). It was based on data from a registry system, and permission was obtained from the system administrator to use the data. The data for this study was also anonymous, and personal identifiers were not included. Therefore, the patient's informed consent was not needed. In this study, all the designs and schemes were carried out with full consideration of safety and security principles and in accordance with the relevant guidelines and regulations (Declaration of Helsinki).
: Not applicable.
: The authors agree to be published in the <i>Journal of Public Health</i>.
: The authors declare that they have no conflict of interest.