1. School of Management and Economics, University of Electronic Science and Technology of China, Chengdu 611731, China.
2. School of Business Administration, Faculty of Business Administration, Southwestern University of Finance and Economics, Chengdu 611130, China (e-mail: kougang@swufe.edu.cn)
3. School of Management and Economics, University of Electronic Science and Technology of China, Chengdu 611731, China (e-mail: pengyi@uestc.edu.cn)