1. Center for Injury Epidemiology and Prevention Columbia University Medical Center New York City New York
2. Department of Anesthesiology College of Physicians and SurgeonsColumbia University New York City New York
3. Department of Epidemiology Mailman School of Public Health Columbia University New York City New York
4. Department of Surgery New York University School of Medicine New York City New York
5. Department of Emergency Medicine School of Medicine University of Colorado Anschutz Medical Campus Aurora Colorado
6. Department of Epidemiology Colorado School of Public Health University of Colorado Anschutz Medical Campus Aurora Colorado
7. Department of Health, Behavior and Society Bloomberg School of Public Health Johns Hopkins University Baltimore Maryland