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Authors
Liu, Lefan
Huang, Jing
Li, Guoxing
Chen, Zhuo
He, Tianfeng
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Article History
Received: 18 June 2021
Accepted: 9 March 2022
First Online: 20 April 2022
Declarations
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: The survey protocols, instruments, and the process for obtaining the data were approved by the Institutional Review Board of Ningbo Municipal CDC [March 4, 2016; Reference No. IRB201603]. This approval applies to our survey conducted 2016–2020. All participants provided written informed consent prior to the surveys (for participants under 16-years-old, their parents fill in the informed consent form instead). We confirm that all methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.
