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Authors
Liu, Ping
Liu, Shimeng
Gong, Tiantian
Li, Quan
Chen, Gang
Li, Shunping https://orcid.org/0000-0001-8144-6220
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Funding
Funding for this research was provided by:
Cheeloo College of Medicine, Shandong University (QLYXJY-201875)
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Article History
Received: 17 February 2021
Accepted: 29 June 2021
First Online: 6 July 2021
Declarations
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: The study was approved by the Ethics Review Board of the School of Preventive Medicine, Shandong University (Reference No. 20170301). Informed consent was obtained from all participants prior to questionnaire administration.
: Not applicable.
: The authors declare that they have no competing interests.
