Funding for this research was provided by:
512 Talent training Project of Bengbu Medical College (BY51201203, BY51201203, BY51201203, BY51201203, BY51201203, BY51201203)
Received: 10 January 2022
Accepted: 24 May 2022
First Online: 4 June 2022
: The CLHLS study was approved by the Research Ethics Committee of Peking University (IRB00001052–13074), and all participants or their proxy respondents provided written informed consent. The research was performed in accordance with the Declaration of Helsinki. All procedures were performed in accordance with relevant guidelines.
: Not applicable.
: The authors declare that they have no conflicts of interest.