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Article History

Received: 9 January 2023

Accepted: 14 March 2023

First Online: 5 April 2023

Declarations

:

: CHARLS passed the approval of the Biomedical Ethics Committee of Peking University (IRB00001052-11015) and an informed consent form was signed by each interviewee. All participants in this study were fully informed about the purpose and methods of this study.

: All the participants were required to provide informed consent prior to accessing the questionnaire.

: Not applicable.

: All authors declare that they have no conflicts of interest.