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Authors
Huang, Xiangyu
Liang, Yihao
Fan, Weihua
Liu, Wei
Wu, Buling
Li, Jianbo
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Article History
Received: 22 March 2021
Accepted: 28 August 2021
First Online: 25 September 2021
Declarations
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: This study was approved by the Stomatological Ethics Committee of the Chinese Stomatological Association (Approval No.: 2014–003). Written informed consents were obtained from all the participants. The National Health Commission of the PRC had approved the study program before the field survey. This survey was conducted strictly according to the study program. Therefore, according to Chinese legislation, all methods were carried out following relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.
