1. Department of Mathematics, Faculty of Physical Sciences, Ahmadu Bello University, Zaria, Nigeria
2. Department of Mathematics, Taif University, Taif, 21944, Saudi Arabia
3. Institut Superieur d Informatique et des Techniques de Communication, Université de Sousse, 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
6. Research Institute for Natural Sciences, Hanyang University, Seoul, 04763, Korea