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Article History

Received: 6 May 2023

Accepted: 16 January 2024

First Online: 1 February 2024

Declarations

:

: The datasets that support this article are publicly available from the project of the CLHLS. It was approved by research ethics committees of Peking University (IRB0000105213074). The participants provided their written informed consent to participate in this study. And informed consent was obtained from literate participants and legal guardian(s)/next of kin of illiterate participants. All methods were performed in accordance with the guidelines and regulations.

: Not applicable.

: The authors declare no competing interests.