Wang, Qianqian
Zhang, Yanzhuo
Wu, Chengai
Funding for this research was provided by:
Pilot Project of Public Welfare Development and Reform for Commonweal Scientific Institutes in Beijing (Jingyiyan 2019-9)
Article History
Received: 8 October 2021
Accepted: 3 February 2022
First Online: 15 February 2022
Declarations
:
: All procedures and methods performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Ethics approval for the data collection in the CHARLS was obtained from the Biomedical Ethics Review Committee of Peking University (IRB00001052-11015). Each participant included in this study signed a written informed consent form before taking the survey.
: Not applicable.
: The authors declare no conflict of interest.