Zhou, Yue
Wushouer, Haishaerjiang
Vuillermin, Daniel
Guan, Xiaodong http://orcid.org/0000-0002-1290-3827
Shi, Luwen
Article History
Received: 15 August 2020
Accepted: 13 January 2021
First Online: 13 February 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Ethical approval for this study was not necessary because it was based exclusively on publicly available data, CHARLS, and the study subjects were not directly approached.
: Not applicable.
: All authors confirm their consent for publication.