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Authors
Cao, Cong
Yang, Shan
Sun, Kexin
Gu, Junlian
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (31800936, 31800936)
Natural Science Foundation of Shandong Province (ZR2019BC111)
Social Science Planning Fund of Shandong Province (18DJYJ01)
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Article History
Received: 27 December 2021
Accepted: 27 March 2022
First Online: 26 April 2022
Compliance with Ethical Standards
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: The authors declare that they have no conflict of interest.
: The present study was approved by Ethics Committee of Shandong University. All procedures performed in this study were in accordance with the ethical standards on human experimentation of the ethics committee of Shandong University and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent (adolescents, parents and school principals) was obtained from all participants for being included in the study.
