Article History
Received: 29 September 2022
Accepted: 20 March 2023
First Online: 6 April 2023
Declarations
:
: The data collection is in accordance with the ethical standards of the Ethical Review Committee of Peking University. Informed consent forms were obtained from all subjects or their legal guardian(s) before data collection. This study is a secondary analysis of the China Health and Retirement Longitudinal Study (CHARLS) public data in 2018, which was approved by the Ethical Review Committee of Peking University.
: Not applicable.
: The authors declare that they have no competing interests.