Wan, Jingxuan
Zhang, Qing
Li, Chunxiao
Lin, Jiangtao
Article History
Received: 27 December 2020
Accepted: 23 April 2021
First Online: 4 October 2021
Declarations
:
: The study was conducted in accordance with the declaration of Helsinki. The study was approved by the Biomedical Ethics Review Committee of Peking University (IRB00001052-11015). Ethics approval for the use of CHARLS data was obtained from the University of Newcastle Human Research Ethics Committee (H-2015-0290). And all the participants gave their written informed consent before any study procedures began.
: Not applicable.
: The authors declare that they have no competing interests.