1. Department of Mathematics, COMSATS University Islamabad, Attock Campus, Attock, 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, Gilan-E-Gharb Branch, Islamic Azad University, Gilan-E-Gharb, Iran
6. Department of Mathematics, University of Management and Technology, Lahore, Pakistan