Funding for this research was provided by:
National Natural Science Foundation of China (Grant nos. 81974206)
Hunan Provincial Science and Technology Department (2019SK1012)
the Scientific Research project of Hunan Provincial Commission of Health (C2019010)
Article History
Received: 20 February 2020
Accepted: 2 July 2020
First Online: 10 July 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.