1. Department of Mathematics, University of Gujrat, Gujrat 50700, Pakistan
2. Department of Mathematics, Government College University Lahore (GCUL), Lahore 54000, Pakistan
3. Department of Medical Research, China Medical University, Taichung 406040, Taiwan
4. Department of Mathematics and Applied Mathematics, University of Pretoria, Lynnwood Road, Pretoria 0002, South Africa
5. Department of Mathematics, Faculty of Science, Jazan University, Jazan 45142, Saudi Arabia
6. Institute of Research and Development of Processes, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), Campus of Leioa, 48940 Leioa, Bizkaia, Spain