Funding for this research was provided by:
National Social Science Foundation of China (15BGL048)
Hubei Province Science and Technology Support Project (2015BAA072)
Hubei Provincial Natural Science Foundation of China (2017CFA012)
The Fundamental Research Funds for the Central Universities (2017II39GX)
Article History
Received: 30 July 2018
Revised: 9 August 2018
Accepted: 15 August 2018
First Online: 6 September 2018