1. Department of Mathematics, Faculty of Physical Sciences, Ahmadu Bello University, Zaria, Nigeria
2. Department of Mathematics, Government College University, Faisalabad, Pakistan
3. Department of Mathematics, Grand Asian University, Sialkot, 7KM, Pasrur Road, Sialkot 51310, Pakistan
4. Institut Supérieur D’Informatique et des Techniques de Communication, Université de Sousse, Sousse 4000, Tunisia
5. China Medical University Hospital, China Medical University, Taichung 40402, Taiwan
6. Department of Mathematics and Applied Mathematics, Sefako Makgatho Health Sciences University, Ga-Rankuwa, South Africa
7. Quantum Leap Africa (QLA), AIMS Rwanda Centre, Remera Sector KN 3, Kigali, Rwanda
8. African Center for Advanced Studies (ACAS), P.O. Box 4477, Yaoundé, Cameroon