1. School of Internet Finance and Information Engineering, Guangdong University of Finance, Guangzhou 510520, China
2. School of Management Science and Information Engineering, Jilin University of Finance and Economics, Changchun 130117, Jilin, China
3. College of Information Science and Technology, Jinan University, Guangzhou 510632, China
4. School of Management, Jilin University, Changchun 130022, Jilin, China