1. Center for Applied Statistics, School of Statistics, Renmin University of China, Beijing, People's Republic of China
2. Department of Medical Engineering and Technology, Xinjiang Medical University, Ürümqi, People's Republic of China
3. School of Statistics, Lanzhou University of Finance and Economics, Lanzhou, People's Republic of China
4. School of Statistics and Information, Xinjiang University of Finance, Ürümqi, People's Republic of China
5. Department of Mathematics, College of Engineering, Design Physical Sciences, Brunel University London, Uxbridge, UK
6. Department of Mathematics, Statistics and Insurance, Hang Seng University of Hong Kong, Siu Lek Yuen, Hong Kong