1. Department of Statistics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia;
2. School of Mathematical Sciences, Shanghai Jiao Tong University, Shanghai, P.R. China;
3. Department of Statistics, Government College University, Faisalabad, Pakistan;
4. Department of Statistics and Computer Sciences, University of Veterinary and Animal Sciences, Lahore, Pakistan;
5. Department of Industrial and Management Engineering, POSTECH, Pohang, Republic of Korea