Funding for this research was provided by:
the Science and Technology Department of Sichuan Province (SYZ201930)
Bureau of Science and Technology Nanchong City (18SXHZ0434)
the North Sichuan Medical College (CBY17-A-YB07)
Article History
Received: 19 December 2019
Accepted: 27 February 2020
First Online: 13 March 2020
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.