1. School of Management, Suqian University, Suqian, Jiangsu 233800, China
2. School of Management, Harbin Normal University, Harbin, Heilongjiang 150025, China
3. Kunlun Tourism College, Heilongjiang Institute of Technology, Harbin, Heilongjiang 150088, China
4. College of Economics and Management, Hebei Agricultural University, Baoding 071001, China