1. Department of Statistics, University of Peshawar, Peshawar, Pakistan
2. Department of Econometrics and Statistics, PIDE, Islamabad, Pakistan
3. Department of Mathematics and Statistics, The University of Haripur, Haripur, Pakistan
4. Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
5. Department of Mathematics, Faculty of Science, Mansoura University, Mansoura 35516, Egypt