Funding for this research was provided by:
Guangdong Medical Research Foundation (A2019280)
guangdong province introduction of innovative r&d team (2019KCXTD003)
li ka shing foundation (2020LKSFG19B)
Article History
Received: 30 May 2021
Accepted: 22 October 2021
First Online: 8 November 2021
Declarations
:
: This study involved analysis of publicly available data and no individual-level data were used. So ethical approval was not required.
: Not applicable.
: The authors declare that they have no competing interests.