1. Business School, Shenzhen Technology University, 3002 Lantian Road, Shenzhen 518118, P. R. China
2. Research Center of Finance, Shanghai Business School, 2271 West Zhongshan Road, Shanghai 200235, P. R. China
3. GF Fund Management Co., Ltd., 1-33/F, South Tower, Poly International Plaza No. 1 East Pazhou Road, Guangzhou 510308, P. R. China
4. Graduate School of Economics, Kobe University 2-1, Rokkodai,Nada-Ku, Kobe 657-8501, Japan