Funding for this research was provided by:
Doctor Foundation of Southwest University of Science and Technology (16zx7161)
National Training Program of Innovation and Entrepreneurship for Undergraduates (201710619023)
Article History
Received: 4 June 2019
Accepted: 24 September 2019
First Online: 1 October 2019
Compliance with ethical standards
:
: The authors declared to have no competing interests relevant to this article.
: This study does not contain any experiment involving human or animal subjects.