Funding for this research was provided by:
National Natural Science Foundation of China (81872708)
National Natural Science Foundation of China (82073668)
Article History
Received: 14 October 2020
Accepted: 11 May 2021
First Online: 2 June 2021
Declarations
:
: The study was approved by the Biomedical Ethics Review Committee of Peking University (IRB00001052–11015). Ethics approval for the use of CHARLS data was obtained from the University of Newcastle Human Research Ethics Committee (H-2015-0290). And all the participants gave their written informed consent before any study procedures began.
: Not applicable.
: The authors declare that they have no competing interests.