1. Zhejiang Huayun Information Technology Co., Ltd., Hangzhou, China
2. School of Economics, Zhejiang University of Finance and Economics, Hangzhou, China
3. Springfield College, Springfield, MA, USA
4. School of Economics and Business Administration, Central China Normal University, Wuhan, China
5. School of Mathematics and Statistics, Central China Normal University, Wuhan, China
6. School of Business and Economics, Maastricht University, Maastricht, Netherlands