1. School of Finance, Hunan University of Technology and Business, Changsha, China
2. Key Laboratory of Hunan Province for Statistical Learning and Intelligent Computation, Hunan University of Technology and Business, Changsha, China
3. Business School, Hunan University, Changsha, China
4. Business School, Jiangsu University of Technology, Changzhou, China
5. School of Finance, Guangdong University of Foreign Studies, Guangzhou, China