1. School of Social and Public Administration, Lingnan Normal University, Zhanjiang 524088, China
2. School of Management, Guangdong Ocean University, Zhanjiang 524088, China
3. School of Economics & Finance, Zhanjiang University of Science and Technology, Zhanjiang 524088, China
4. School of Economics and Management, Jiangxi Agricultural University, Nanchang 330044, China