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Authors
Ma, Ying
Xiang, Qin
Yan, Chaoyang
Liao, Hui
Wang, Jing
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Article History
Received: 5 March 2021
Accepted: 26 July 2021
First Online: 6 September 2021
Declarations
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: All participants joined CHARLS voluntarily and signed a consent form before participation. The original CHARLS was approved by the Ethical Review Committee (IRB) at Peking University in June 2008 (IRB00001052–11015).
: Not applicable.
: The authors declare that they have no competing interests.
