1. School of Urban Economics and Public Administration, Capital University of Economics and Business, Beijing 100070, China
2. School of Business Management, Liaoning Vocation Technical College of Modern Service, Shenyang 110164, Liaoning, China
3. School of Economics and Management, Shanxi Normal University, Linfen 041004, China
4. School of Management, Guangxi University for Nationalities, Nanning, Guangxi 530006, China