Funding for this research was provided by:
National Natural Science Foundation of China (61662025)
the Research Foundation of Philosophy and Social Science of Hunan Province (16YBX042)
the Research Foundation of Education Bureau of Hunan Province (16C1311)
the Startup Project of Doctor Scientific Research of Shaoxing University (20185003)
Article History
Accepted: 15 February 2019
First Online: 22 February 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.