1. School of Information Management and Engineering, Shanghai University of Finance and Economics, Shanghai, China 200433
2. Department of Industrial Engineering and Operations Research, Columbia University, New York, New York 10027
3. Department of Information Systems, Business Statistics and Operations Management, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
4. Leonard N. Stern School of Business, New York University, New York, New York 10012; and New York University Shanghai, Shanghai, China 200122