1. Department of Mathematics and Statistics, Hazara University, Mansehra 21120, Pakistan
2. Department of Computer Science and Mathematics, Lebanese American University, Beirut 11022801, Lebanon
3. Department of Applied Mathematics and Statistics, Technical University of Cartagena, Hospital de Marina, 30203 Cartagena, Spain
4. Department of Mathematics, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia