Funding for this research was provided by:
National Natural Science Foundation of China (81673239, 81973102, 41774001, 41774021)
Received: 28 May 2021
Accepted: 9 November 2021
First Online: 22 November 2021
: The data analysed in this paper do not contain any personal information relating to individual participants (name, image, videos, address). An ethical clearance for the collection of the prevalence data was obtained from the Ethics Committee of Fudan University (ID: IRB#2014-03-0508). Written informed consent was also obtained from all participants. Written informed consent was obtained from a parent or guardian for participants under 16 years old.
: Not applicable.
: The authors declare that they have no competing interest.