1. Department of Mathematics, Quaid-i-Azam university, Islamabad, Pakistan
2. Department of Mathematics and Sciences, Prince Sultan University, Riyadh 11586, Saudi Arabia
3. Université de Sousse, Institut Supérieur d'Informatique et des Techniques de Communication, H. Sousse 4000, Tunisia
4. China Medical University Hospital, China Medical University, Taichung 40402, Taiwan
5. Department of Mathematics and Applied Mathematics, Sefako Makgatho Health Sciences University, Ga-Rankuwa, South Africa