Funding for this research was provided by:
National Social Science Foundation Major Projects (20&ZD132)
the National Social Science Foundation of China (22BTJ045)
Article History
Accepted: 10 June 2023
First Online: 1 August 2023
Declarations
:
: The authors declare that they have no conflict of interest.
: Ethical review and approval were waived for this study due to publically open data from the China National Bureau of Statistics.
: All authors have read and agreed to the published version of the manuscript.