1. School of Mathematics and Statistics, Beijing Institute of Technology, Beijing, People's Republic of China
2. School of Mathematical and Natural Sciences, Arizona State University, Tempe, AZ, USA
3. Department of Statistics and National Center for Forensic Science, University of Central Florida, Orlando, FL, USA
4. Department of Statistics, Rehabilitation Medicine Department, NIH Clinical Center, Bethesda, MD, USA
5. George Mason University, Fairfax, VA, USA
6. LSC Academy of Mathematics and Systems Science, Chinese Academy of Sciences and University of Chinese Academy of Sciences, Beijing, People's Republic of China