1. Department of Mathematics, University of Swabi, Khyber Pakhtunkhwa, Pakistan
2. Department of Basic Sciences, University of Engineering and Technology Peshawar, Khyber Pakhtunkhwa, Pakistan
3. Department of Mathematics, Firat University, Elazig, Turkey + Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwane
4. School of Mathematics and Information Science, Henan Polytechnic University, Jiaozuo, China
5. Department of Mathematics, College of Science, King Saud University, Riyadh, Saudi Arabia