Hu, Xiaoqian
Gu, Shuyan
Zhen, Xuemei
Sun, Xueshan
Gu, Yuxuan
Dong, Hengjin http://orcid.org/0000-0002-5064-7297
Funding for this research was provided by:
National Natural Science Foundation of China (71490732)
Article History
Accepted: 17 February 2022
First Online: 14 March 2022
Declarations
:
: The authors declare that they have no conflict of interest.
: The CLHLS has been approved by Research Ethics Committees of Duke University and Peking University.
: Every participant provided written informed consent before the survey.
: Not applicable.