Duan, Ying
Qi, Qi
Cui, Yan
Yang, Ling
Zhang, Min
Liu, Huaqing
Article History
Received: 12 October 2022
Accepted: 6 March 2023
First Online: 14 March 2023
Declarations
:
: 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 competing interests.