1. Department of Statistics, Quaid-i-Azam University, Islamabad, Pakistan
2. State Key Laboratory of Hydro-Science and Engineering and Dept. of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
3. Department of Mathematics, COMSATS University Islamabad, Islamabad, Pakistan
4. Bradford Institute of Health Research, University of Bradford, UK
5. Department of Statistics, COMSATS University Islamabad, Lahore Campus, Pakistan
6. Department of Statistics, University of Sargodha, Sargodha, Pakistan
7. Johann Bernoulli Institute, Groningen University, Groningen, 9747AG, The Netherlands
8. Department of Statistics, Government College University Faisalabad, Faisalabad, Pakistan