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Authors
Li, Hao
Ge, Miao
Zhang, Mingxin
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Funding
Funding for this research was provided by:
National Nature Science Foundation (40971060)
Nature Science Foundation of Ningxia (2020AAC03114)
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Article History
Received: 8 March 2021
Accepted: 15 June 2022
First Online: 22 June 2022
Declarations
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: The data used in this study need to be downloaded after application for approval. The data of this study have been approved for use by the Data-center of China Public Health Science (ExternalRef removed) of the Chinese Center for Disease Control and Prevention. The data of this study were anonymous before use.
: Not applicable.
: The authors declare that they have no competing interests.
