1. Department of Statistics, Yunnan University of Finance and Economics, Kunming, People's Republic of China
2. Department of Statistics and Data Science, Southern University of Science and Technology, Shenzhen, People's Republic of China
3. Department of Statistics and Actuarial Science, The University of Hong Kong, Hong Kong, People's Republic of China
4. College of Economics, Shenzhen University, Shenzhen, People's Republic of China