1. Department of Mathematics and Statistics, Faculty of Science, University of Lahore, Lahore, Pakistan
2. Department of Pharmaceutical Sciences, "Vasile Goldiş" Western University of Arad, Arad 310048, Romania
3. Department of Medical Research, China Medical University, Taichung 40402, Taiwan
4. Department of Mathematics and Sciences, Prince Sultan University, Riyadh 11586, Saudia Arabia