1. School of Economics and Management, Nanjing University of Science and Technology, Nanjing 210094 China (e-mail: pzhu@njust.edu.cn).
2. School of Intellectual Property, Nanjing University of Science and Technology, Nanjing 210094 China (e-mail: hhujame@qq.com).
3. College of Business, The University of Alabama in Huntsville, Huntsville, AL 35899 USA (e-mail: lixi@uah.edu).
4. College of Business, The University of Alabama in Huntsville, Huntsville, AL 35899 USA (e-mail: q.zhu@uah.edu).