1. Business School, Ningbo University, Ningbo 315211, China
2. Central and Eastern European Countries Economic and Trade Cooperation Institute, Ningbo University, Ningbo 315211, China
3. School of Finance and Management, Zhejiang Financial College, Hangzhou 310018, China
4. College of Resources & Environmental Science, Shijiazhuang University, Shijiazhuang 050035, China