1. Department of Management Science, City University of Hong Kong, Hong Kong. E-mail: wenhachen2-c@my.cityu.edu.hk
2. School of Software Engineering, South China University of Technology, Guangzhou, China. E-mail: ycai@scut.edu.cn
3. Department of Industrial and Manufacturing Systems Engineering, Hong Kong University, Hong Kong. E-mail: mskklai@cityu.edu.hk
4. International Business School, Shaanxi Normal University, Xian, China
5. Department of Mathematics and Information Technology, The Education University of Hong Kong, Hong Kong. E-mail: hrxie2@gmail.com