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Authors
Cao, Cong
Sun, Kexin
Cao, Lili
Li, Feifei
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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: 29 August 2021
Accepted: 30 August 2021
First Online: 13 September 2021
Compliance with Ethical Standards
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: The authors declare no competing interests.
: 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.
