Zhang, Fuli
Ruan, Xianle
Wang, Xian
Liu, Zhihua
Hu, Lizong
Li, Chengwei
Funding for this research was provided by:
the Scientific and Technological Project of Henan Provincial Science and Technology Department of China (132300410032)
the Scientific Research Foundation of Zhoukou Normal University (zknuA201407)
the Middle-aged Backbone Teacher Foundation of Zhoukou Normal University.
the Middle-aged Backbone Teacher Foundation of College and University in Henan Province (2013GGJS-176)