1. School of Economics, Jinan University, Guangzhou 510632, P. R. China
2. School of Business Administration, Dongbei University of Finance and Economics, Dalian 116025, P. R. China
3. School of Public Finance and Taxation, Zhongnan University of Economics and Law, Wuhan 430073, P. R. China
4. School of Finance, Jiangxi Normal University, Nanchang 330022, P. R. China