Funding for this research was provided by:
National Natural Science Foundation of China (71874005)
The State funds for social science project (19CRK009)
Received: 20 December 2019
Accepted: 15 June 2020
First Online: 19 June 2020
Ethics approval and consent to participate
: The survey ethics committees of Duke University and Peking University approved the protocol for each wave of the CLHLS, which is the data source of this study.
: Not applicable.
: The authors declare that they have no competing interests.