Zhou, Xue-ying
Yao, Mi
Qi, Jian-guang http://orcid.org/0000-0002-2581-5455
Qi, Zhen-nan
Liang, Wei-lan
Article History
Received: 21 July 2022
Revised: 13 September 2022
Accepted: 25 September 2022
First Online: 28 October 2022
Competing interests
: The authors declare no competing interests.
: This study was reviewed and approved by the PKUFH Biomedical Research Ethics Committee and was conducted according to the tenets of the 1964 Declaration of Helsinki and its later amendments. Verbal informed consent was obtained from the parents or guardians who answered the phone before the survey started.