1. Nanchang Institute of Technology, Nanchang 330044, P. R. China
2. School of Computer Science and Technology, Xuzhou University of Technology, Xuzhou 221018, P. R. China
3. Department of Mathematics, University of Management and Technology, Lahore, Pakistan
4. Department of Mathematics, Namal University, Talagang Road, Mianwali 42250, Pakistan
5. Department of Basic Medical Sciences, College of Applied Medical Science, King Khalid University, Abha 61421, Saudi Arabia