Hu, Li-Kun
Liu, Yu-Hong
Yang, Kun
Chen, Ning
Ma, Lin-Lin
Yan, Yu-Xiang
Funding for this research was provided by:
National Natural Science Foundation of China (81773511)
Article History
Received: 25 August 2022
Accepted: 30 December 2022
First Online: 7 January 2023
Declarations
:
: Ethical approval for all the CHARLS waves was granted by the Institutional Review Board at Peking University.
: Not applicable.
: The authors declare no competing interests.