1. College of Science, Liaoning University of Technology, Jinzhou, China
2. Department of Basic, Officers College of PAP, Chengdu, China
3. School of Mathematics and Statistics, Ningbo University, Ningbo, China
4. College of Science, Inner Mongolia University of Technology, Hohhot, China + Inner Mongolia Key Laboratory of Statistical Analysis Theory for Life Data and Neural Network Modeling, Inner Mongolia University of Technology, Hohhot, China