1. School of Economics, Peking University, Beijing, China
2. Postdoctoral Research Center of Agricultural Bank of China, Beijing, China
3. Research Center for Economy of Upper Reaches of Yangtze River, Chongqing Technology and Business University, Chongqing, China
4. Chongqing College of Electronic Engineering, Chongqing Research Center of High-skilled Personnel Development, Chongqing, China