1. Department of Mathematics and Statistics, College of Science, King Faisal University, Hafuf 31982, Al Ahsa, Saudi Arabia
2. Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA), Universite Catholique de Louvain (UCLouvain), Louvain-la-Neuve 1348, Belgium
3. Department of Mathematics, Eastern Mediterranean University, Gazimagusa, Via Mersin 10, Turkey