Funding for this research was provided by:
National Natural Science Foundation of China (31801470)
Undergraduate Training Program for Innovation and Entrepreneurship of Nanchang University (2018303, 20190402112)
Article History
Received: 26 December 2018
Accepted: 26 June 2019
First Online: 8 July 2019
Compliance with ethical standards
:
: The authors have no conflict of interest.