Funding for this research was provided by:
National Natural Science Foundation of China (71490735, 17CRK023, 71490734)
Global Asia Institute-JY Pillay Comparative Asia Research Center grant (CARC-2016-001)
Text and Data Mining valid from 2019-09-04
Received: 27 November 2018
Accepted: 27 August 2019
First Online: 4 September 2019
Ethics approval and consent to participate
: The data used in our research is secondary data. The data from CLHLS survey already obtained the ethical approval and informed consent, and was approved by research ethics committees of Duke University and Peking University (IRB00001052–13074).
: Not Applicable.
: The authors declare that they have no competing interests. Qiushi Feng is a member of the editorial board (Associate Editor) of this journal.