Cheng, Gang
Yan, Yan http://orcid.org/0000-0001-7479-637X
Funding for this research was provided by:
National Natural Science Foundation of China (81973153, 81673276, 81373101)
Article History
Received: 13 August 2020
Accepted: 4 February 2021
First Online: 16 February 2021
Ethics approval and consent to participate
: The CLHLS study was approved by the Biomedical Ethics Committee of Peking University, Beijing, China (IRB00001052–13074), and informed consent was obtained from all participants or their proxy respondents.
: Not applicable.
: The authors declare that they have no competing interests.