1. College of Science, Hunan City University, Yiyang, P. R. China
2. Department of Mathematics, Huzhou University, Huzhou, P. R. China
3. Department of Mathematics, Faculty of Science, Ghazi University, D. G. Khan, Pakistan
4. Department of Mathematics, Khawaja Fareed University of Engineering & Information Technology, Rahim Yar Khan, Punjab, Pakistan
5. Department of Computer Engineering, Biruni University, Istanbul, Turkey
6. Department of Medical Research, China Medical University, Taichung, Taiwan