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Authors
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Funding
Funding for this research was provided by:
Decision-making and Management Project of Shapingba District Science and Technology Commission (jc201603)
Research Special Fund for Public Welfare Industry of Health (No.201202010)
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Article History
Received: 7 May 2019
Accepted: 22 June 2020
First Online: 6 July 2020
Competing interest
: The authors declare that they have no conflict of interest.
: The study was approved by Biomedical Ethics Committee of Peking University (IRB 00001052–13,034) and the ethical committee of the Chongqing Medical University and written inform consent was obtained from students and their parents before investigation in the research.
: Not applicable.
