1. School of Management, University of Science and Technology of China, 230026 Hefei, China
2. Department of Industrial Systems Engineering and Management, National University of Singapore, Singapore 117576
3. Department of Decision Sciences and Managerial Economics, CUHK Business School, Chinese University of Hong Kong, Shatin, Hong Kong
4. Department of Industrial and Systems Engineering, North Carolina State University, Raleigh, North Carolina 27695