Funding for this research was provided by:
National Natural Science Foundation of China (51277022)
Chongqing Education Council Foundation (KJ1501312)
Chongqing University of Science and Technology doctoral Foundation (CK2016B17)
Article History
Received: 22 May 2017
Revised: 25 February 2018
Accepted: 27 February 2018
First Online: 23 March 2018