Li, Zhen
Cao, Lianmeng
Zhou, Ziyu
Han, Maozhi
Fu, Chang
Article History
Received: 12 July 2022
Accepted: 20 October 2022
First Online: 15 February 2023
Declarations
:
: CHARLS has been approved by the Ethical Review Committee of Peking University and ethical approval of the present data analysis was not needed. All subjects gave their informed consent for inclusion before participating in the survey. All methods in the present study were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The author(s) declared no competing interest.