Chen, Qiao
Article History
Received: 14 June 2023
Accepted: 27 November 2023
First Online: 10 December 2023
Declarations
:
: The study was conducted in accordance with the ethical principles of the World Medical Association Declaration of Helsinki and was approved by the ethics committee of Women and children’s hospital of Chongqing Medical University (reference number: no. 2018(009)). Reporting of data was based on the Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) guidelines. Written informed consent was obtained from all participants’ parents included in the study.
: Not applicable.
: The authors declare no competing interests.