1. Department of Mathematics, Gomal University, Dera Ismail Khan 29050, Pakistan
2. Université de Sousse, Institut Supérieur d’Informatique 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, COMSATS University Islamabad, Wah Cantt. 47040, Pakistan
6. Department of Mathematics, Taiz University, Taiz 6803, Yemen