1. School of Economics, Jinan University, Huangpu West Road No. 601, Guangzhou, Guangdong Province, China
2. Instituto Superior de Economia e Gestão, University of Lisbon, Rua Miguel Lupi, 20, Lisboa, 1249-078, Portugal
3. Zhujiang Business School, GRC Bank, Huaxia Road No. 1, Guangzhou, Guangdong Province, China