Liu, Jue
Jing, Wenzhan
Liu, Min
Funding for this research was provided by:
National Natural Science Foundation of China (72122001; 71934002; 71874003, 72122001; 71934002; 71874003)
Article History
Received: 19 August 2021
Accepted: 3 March 2022
First Online: 14 March 2022
Declarations
:
: Data is publicly available from the National Health Statistics Yearbooks and National Statistical Yearbooks, thus the ethics approval and consent to participate is waived from the IRB of Peking University.
: Not Applicable.
: The authors declare that they have no competing interests.