1. Department of Mathematical Sciences, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
2. Department of Statistics, Quaid-i-Azam University, Islamabad 44000, Pakistan
3. Department of Mathematics, Tafila Technical University, Tafila 66110, Jordan
4. Independent Researcher, 31 Carrolton Road, Boston, MA 02132, USA
5. Department of Mathematics and Statistics, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada