1. National Clinician Scholars Program, Corporal Michael J. Crescenz Veterans Affairs Medical Center, University of Pennsylvania, Philadelphia
2. Center for Emergency Care Policy and Research, Perelman School of Medicine, Department of Emergency Medicine, University of Pennsylvania, Philadelphia
3. Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia
4. Penn Injury Science Center, Philadelphia, Pennsylvania
5. Perelman School of Medicine, Department of Biostatistics and Epidemiology, University of Pennsylvania, Philadelphia