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Authors
Yan, Jingzheng
Wang, Meijuan
Cao, Yingjuan
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Article History
Received: 31 January 2022
Accepted: 31 August 2022
First Online: 24 September 2022
Declarations
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: This study used data from the CHARLS. Ethics approval was not required to analyze these data. The Peking University Biomedical Ethics Review Committee approved the CHARLS and all participants were required to provide a written informed consent. The ethical approval number is IRB00001052–11015.
: Not applicable.
: All authors declare that there are no conflicts of interest.
