1. Department of Mathematics, Capital University of Science and Technology, Islamabad, Pakistan
2. Institut Supérieur d'Informatique et des Techniques de Communication, Université de Sousse, H. Sousse, Tunisia
3. China Medical University Hospital, China Medical University, Taichung 40402, Taiwan
4. Department of Mathematics and Applied Mathematics, Sefako Makgatho Health Sciences University, Ga-Rankuwa, South Africa
5. Department of Mathematics and Sciences, Prince Sultan University, Riyadh 11586, Saudi Arabia