1. School of Mathematical Sciences, Ministry of Education Key Laboratory of Scientific and Engineering Computing, Shanghai Jiao Tong University, Shanghai, China
2. School of Mathematics and Statistics & Fujian Provincial Key Laboratory of Statistics and Artificial Intelligence, Fujian Normal University, Fuzhou, Fujian, China
3. Wang Yanan Institute for Studies in Economics and School of Economics, Xiamen University, Xiamen, Fujian, China
4. Department of Statistics, North Carolina State University, Raleigh, NC