1. Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA.
2. Department of Trauma Services, Medical City Plano, Plano, Texas, USA.
3. Department of Trauma Services, Swedish Medical Center, Englewood, Colorado, USA.
4. Department of Trauma Services, Wesley Medical Center, Wichita, Kansas, USA.
5. Department of Trauma Services, Penrose Hospital, Colorado Springs, Colorado, USA.
6. Department of Trauma Services, St. Anthony Hospital, Lakewood, Colorado, USA.
7. Department of Trauma Services, South Texas Health System McAllen, McAllen, Texas, USA.
8. Injury Outcomes Network, Englewood, Colorado, USA.