1. College of Mathematics and Statistics, Institute of Statistical Sciences, Shenzhen University, ShenZhen, China.
2. School of Statistics, Capital University of Economics and Business, Beijing, China.
3. Beijing Institute for Scientific and Engineering Computing, Beijing University of Technology, Beijing, China.
4. Department of Mathematics, Hong Kong Baptist University, Hong Kong, China.
5. Department of Computer Science, Hong Kong Baptist University, Hong Kong, China.