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Authors
Huang, Yiqing
Qi, Fei
Wang, Rui
Jia, Xiaorong
Wang, Yani
Lin, Peng
Geng, Meiyun
Li, Shanpeng http://orcid.org/0000-0003-0940-8742
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Funding
Funding for this research was provided by:
Health Scientific Research Program of Qingdao (2017-WJZD130)
Health Scientific Research Program of Qingdao (2017-WJZD130)
Medical and Health Discipline Construction Project of Qingdao (2020B047, 2020B047)
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Article History
Received: 27 April 2021
Accepted: 26 July 2021
First Online: 12 August 2021
Declarations
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: The survey protocols, instruments, and the process for obtaining the informed consent for participants were carried out in accordance with relevant guidelines and regulations and were approved by the Institutional Review Board of Qingdao Municipal CDC. All participants provided written informed consents prior to the survey (parents issued their informed consent form instead for participants below 16 years old).
: Not applicable.
: The authors declare that they have no competing interests.
