1. Department of Mathematics and Statistics, International Islamic University, Islamabad, Pakistan
2. Université de Sousse, Institut Supérieur dínformatique et des Techniques de Communication, H. Sousse 4000, Tunisia
3. Department of Mathematics and Applied Mathematics, Sefako Makgatho Health Sciences University, Ga-Rankuwa, South Africa
4. China Medical University Hospital, China Medical University, Taichung 40402, Taiwan
5. Department of Mathematics and General Sciences, Prince Sultan University, P.O. Box 66833, Riyadh 11586, Saudi Arabia