Received: 18 September 2020
Accepted: 10 November 2021
First Online: 19 March 2022
: Expedited approval by The Ethics Committee of Chongqing Medical University. All participants understood the nature of the research project and the parents or guardians of the study participants gave written consent for their respective children to participate in this study.
: Not applicable.
: No potential conflicts of interest relevant to this article are reported.