1. Center for Policy and Research in Emergency Medicine, Department of Emergency Medicine, Oregon Health & Science University, Portland, Oregon;
2. Department of Emergency Medicine, University of California at Davis, Sacramento, California;
3. Department of Emergency Medicine, Denver Health Medical Center, Denver, Colorado;
4. Department of Epidemiology, Colorado School of Public Health, University of Colorado School of Medicine, Aurora, Colorado;
5. Department of Emergency Medicine, University of California San Francisco, San Francisco General Hospital, San Francisco, California;
6. Departments of Emergency Medicine and
7. Department of Surgery, University of Washington, Seattle, Washington;
8. Surgery, Stanford University, Palo Alto, California;
9. Intermountain Injury Control Research Center, University of Utah, Salt Lake City, Utah; and
10. Division of Emergency Medicine, Department of Surgery, University of Utah School of Medicine, Salt Lake City, Utah