1. School of Management, Xi'an Jiaotong University, Xi'an 710049 China (e-mail: smilewhx@163.com).
2. Advanced Institute of Business, Tongji University, Shanghai 200092 China (e-mail: xieen@tongji.edu.cn).
3. School of Management, Xi'an Jiaotong University, Xi'an 710049 China (e-mail: gaojingzhe@stu.xjtu.edu.cn).