1. Leonard Davis Institute of Health Economics; Colonial Penn Center; University of Pennsylvania; 3641 Locust Walk Philadelphia PA
2. Department of Health Policy and Management; Johns Hopkins Bloomberg School of Public Health; Baltimore MD
3. Health Policy Center; Urban Institute; Washington DC
4. Perelman School of Medicine; Center for Emergency Care Policy & Research; University of Pennsylvania; Philadelphia PA
5. Wharton School and Perelman School of Medicine; Leonard Davis Institute of Health Economics; Colonial Penn Center; University of Pennsylvania; Philadelphia PA