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Authors
Cheng, Haozhe
Gu, Yiran
Ma, Xiaochen
Tang, Haoqing
Liu, Xiaoyun
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Article History
Received: 15 April 2022
Accepted: 11 July 2022
First Online: 17 July 2022
Declarations
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: CHARLS was approved by the Biomedical Ethics Review Committee of Peking University, and the ethical approval number was IRB00001052-11015. All procedures were in accordance with the ethical standards of the Helsinki Declaration. Participants provided informed consent before data collection.
: Not applicable.
: The authors declare no conflict of interest.
