1. Trauma Research Program, Chandler Regional Medical Center, Chandler, Arizona;
2. Division of Biostatistics and Epidemiology, School of Public Health and Health Sciences, University of Massachusetts, Amherst, Massachusetts;
3. Department of Anesthesiology, University of Rochester School of Medicine and Dentistry, Rochester, New York;
4. Boston University School of Medicine, Boston, Massachusetts;
5. Department of Surgery, St. Joseph's Medical Center, Phoenix, Arizona;
6. Department of Surgery, University of Louisville School of Medicine, Louisville, Kentucky;
7. Department of Surgery, William Beaumont Army Medical Center, El Paso, Texas;
8. Larner College of Medicine, University of Vermont, Burlington, Vermont; and
9. Trauma and Acute Care Surgery, Lancaster General Hospital, Lancaster, Pennsylvania