Li, Yingzhen
Kang, Baixue
Zhao, Xueyan
Cui, Xuena
Chen, Jie
Wang, Lijie
Article History
Received: 26 December 2022
Accepted: 15 March 2023
First Online: 28 March 2023
Declarations
:
: This cross-sectional study was conducted in accordance with the principles of the Declaration of Helsinki, and The Public Health Ethics Committee of Shandong University reviewed and approved the study approval (approval number: LL20211116). All methods were carried out in accordance with relevant guidelines and regulations. Informed consent to participate in the study was obtained from all participants and for minors written informed consent was obtained from their parents.
: Not Applicable.
: The authors declare no competing interests.