Funding for this research was provided by:
Nanchong Vocational and Technical College fund for basic scientific research (ZRA1904)
Article History
Received: 18 October 2019
Accepted: 4 March 2020
First Online: 1 April 2020
Compliance with ethical standards
:
: The authors declare no conflicts of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.