Funding for this research was provided by:
Health Commission of Sichuan Provinc (19PJ121)
Health and Family Planning Commission of Sichuan Provinc (16PJ499)
Cadre Health Commission of Sichuan Provinc (川干研2020-222)
Article History
Received: 6 July 2020
Accepted: 15 March 2021
First Online: 24 March 2021
Declarations
:
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.