Wang, Yi
Chen, Zhuo
Zhou, Chengchao
Article History
Received: 3 January 2021
Accepted: 1 April 2021
First Online: 15 April 2021
Declarations
:
: All participants in CHARLS research provided written informed consent and ethical approval for collecting data was received from the Biomedical Ethics Review Committee of Peking University (IRB00001052–11015).
: Not applicable.
: The authors declare that they have no competing interests.