1. Department of Statistics and Financial Mathematics, School of Science, Nanjing university of Science and Technology, Nanjing, P.R. China
2. Department of Mathematics and Statistics, International Islamic University Islamabad, Islamabad, Pakistan
3. Department of Mathematics and Statistics, PMAS-Arid Agriculture University, Rawalpindi, Pakistan
4. Department of Statistics, Cankiri Karatekin University, Cankiri, Turkey
5. Department of Mathematics and Big Data, Anhui University of Science and Technology, Huainan, P.R. China