1. Department of Emergency Medicine Temple University Hospital Philadelphia PA
2. Perelman School of Medicine University of Pennsylvania Philadelphia PA
3. Department of Emergency Medicine Denver Health and Hospital Authority Denver CO
4. Department of Biostatistics, Epidemiology, and Informatics University of Pennsylvania Philadelphia PA
5. Leonard Davis Institute of Health Economics University of Pennsylvania Philadelphia PA
6. Department of Emergency Medicine Sidney Kimmel Medical College Thomas Jefferson University Philadelphia PA
7. Department of Surgery University of Pennsylvania Philadelphia PA
8. Center for Emergency Care Policy and Research Department of Emergency Medicine University of Pennsylvania Philadelphia PA