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Authors
Guo, Lan
Wang, Wanxin
Guo, Yangfeng
Du, Xueying
Shi, Guangduoji
Lu, Ciyong
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Article History
Received: 17 July 2021
Accepted: 1 November 2021
First Online: 9 November 2021
Declarations
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: The study procedures were carried out in accordance with the Declaration of Helsinki. The study obtained ethical approval from the Sun Yat-sen University, School of Public Health Institutional Review Board (Ethics Number: L2017060). All participants and their legal guardians were informed in detail about the design and aims of the study and gave written assent to participate in the study, and written informed consent was obtained from each participant and one of the student’s legal guardians.
: Not applicable.
: The authors declare no conflict of interest.
