Funding for this research was provided by:
Humanities and Social Science Fund of Ministry of Education of China (23JYC840043)
National Social Science Fund of China (17BSH128)
Article History
Received: 28 August 2023
Accepted: 28 December 2023
First Online: 7 February 2024
Declarations
:
: The authors declare no conflict of interest.
: The protocols of CHARLS were approved by the Ethical Committee at Peking University. All participants in the CHARLS gave informed consent.