1. Department of Mathematics, University of Malakand, Chakdara, Pakistan
2. Department of Mathematics and Sciences, Prince Sultan University, Riyadh, Saudi Arabia
3. Department of Mathematics, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
4. Department of Medical Research, China Medical University, Taichung, Taiwan
5. Department of Mathematics and Applied Mathematics, School of Science and Technology, Sefako Makgatho Health Sciences University, Ga-Rankuwa, South Africa