1. Department of Mathematics, University of Poonch Rawalakot , AJK , Pakistan
2. Department of Mathematics and Sciences, Prince Sultan University , Riyadh , Saudi Arabia
3. Department of Mathematics, Allama Iqbal Open University , Islamabad , Pakistan
4. Department of Mathematics, Faculty of Science, Hashemite University , Zarqa , Jordan
5. Department of Medical Research, China Medical University , Taichung 40402 , Taiwan