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Authors
Zhao, Jinfeng
Kong, Fanlei
Li, Shixue
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Article History
Received: 19 March 2021
Accepted: 27 September 2021
First Online: 9 October 2021
Declarations
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: The survey and data use have obtained the written informed consent of all participants. The research program of this was reviewed and approved by the Institutional Review Board (IRB) of Public Health and Preventive Medicine in Shandong University (No. 20180225) and was in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Not applicable.
: The authors declare no conflict of interest.
