Article History
Received: 14 September 2020
Accepted: 10 March 2021
First Online: 14 March 2021
Declarations
:
: CLHLS was approved by the Institutional Review Board, Duke University (Pro00062871), and the Biomedical Ethics Committee, Peking University (IRB00001052–13074). All participants or their legal representatives signed written consent forms to participate in the baseline and follow-up surveys. This study followed the Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) reporting guidelines.
: Written informed consent for publication was obtained from all participants.
: None reported.