1. Lee Kong Chian School of Business, Singapore Management University, Singapore 188065;
2. Institute for Data, Systems, and Society, Department of Civil and Environmental Engineering, and Operations Research Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139;
3. Institute of Operations Research and NUS Business School, National University of Singapore, Singapore 119077;
4. School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 639798