Funding for this research was provided by:
Chinese Center for Disease Control and Prevention (2020FYH019)
Project of Chengdu Municipal Health Commission (2020211)
Article History
Received: 28 December 2021
Accepted: 22 February 2022
First Online: 12 March 2022
Declarations
:
: The authors declare no competing interests.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: For this type of study formal consent is not required.
: All authors agreed to publish.