1. Shenzhen University Webank Institute of Fintech, Shenzhen University, Shenzhen 518052, China
2. School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510630, China
3. School of Business and Tourism, Sichuan Agricultural University, Chengdu 610000, China
4. Department of Qualitative Economics and Mathematics, School of Statistics and Mathematics, Zhongnan University of Economics and Law, Wuhan 430073, China