1. Yuanpei College, Shaoxing University, Shaoxing, Zhejiang, China
2. Zhejiang University of Science and Technology, Hangzhou, Zhejiang, China
3. Zhejiang Dingli Industrial Company, Huzhou, Zhejiang, China
4. School of Economics, Sichuan University, Chengdu, China
5. College of Statistics, Chongqing University, Chongqing, China