1. Department of Engineering Management and Systems Engineering, The George Washington University, Washington, DC, USA
2. Department of Emergency Medicine, Johns Hopkins University, Baltimore, MD, USA
3. Center for Disease Dynamics, Economics, & Policy, Washington, DC, USA
4. Department of Emergency Medicine, University of California, Davis, Sacramento, CA, USA
5. Department of Medicine, The GW Medical Faculty Associates, Washington, DC, USA
6. Departments of Human Development and Psychology, Center for Behavioral Economics and Decision Research and Human Neuroscience Institute, Cornell University, Ithaca, NY, USA