Yang, Le
Wang, Hongman
Cheng, Jingmin
Article History
Received: 10 May 2021
Accepted: 17 December 2021
First Online: 5 January 2022
Declarations
:
: 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). All methods were carried out in accordance with relevant guidelines and regulations.
: Not Applicable.
: The corresponding author states that there is no conflict of interest.