1. Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, Alberta T6G 2G1, Canada
2. School of Finance and Statistics, East China Normal University, Shanghai 200062, China
3. Yunnan Key Laboratory of Statistical Modeling and Data Analysis, Yunnan University, Kunming 650091, People’s Republic of China
4. Department of Statistics, Beijing Normal University at Zhuhai, Zhuhai, China
5. Department of Biostatistics and Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, U.S.A