Funding for this research was provided by:
Yunnan Provincial Science and Technology Department (2019FE001 (-115))
the Yunnan Clinical Medicine Center for Respiratory Diseases (2019LCZXKF-HX03)
Yunnan province medical science and technology project (2018NS0271)
Received: 2 September 2020
Accepted: 29 January 2021
First Online: 9 February 2021
Ethics approval and consent to participate
: This article is a database research and therefore ethics approval and consent to participate are not needed.
: This article is a database research and therefore consent for publication is not needed.
: The authors claim no competing interests for this study.