He, Baoshan
Du, Gengan
Funding for this research was provided by:
Foundation of Henan Educational Committee (13A550194)
Henan Science and Technology Cooperation Project (172106000014)
National Natural Science Foundation of China (61301037)
Fundamental Research Funds for the Henan Provincial Colleges and Universities (2014YWQQ05)
Youth Backbone Teacher Training Program of Henan University of Technology
Article History
Received: 21 November 2017
Revised: 1 January 2018
Accepted: 17 February 2018
First Online: 3 March 2018
Compliance with ethical standards
:
: The authors declare that there is no conflict of interest.