Received: 28 June 2021
Accepted: 9 November 2021
First Online: 23 November 2021
: The data used in our research is secondary data. The CLHLS study was approved by the Research Ethics Committee of Peking University and Duke University (IRB00001052–13074). The informed consent was signed by the subject or a close relative. All methods were performed in accordance with relevant guidelines and regulations.
: Not Applicable.
: The authors declare that they have no competing interests.