1. Department of Emergency Medicine; University of Colorado School of Medicine; Aurora Colorado
2. Harvard Injury Control Research Center; Harvard School of Public Health; Boston Massachusetts
3. Adult and Child Center for Health Outcomes Research and Delivery Science; University of Colorado Anschutz Medical Campus; Aurora Colorado
4. Butler Hospital; Providence Rhode Island
5. Department of Emergency Medicine; Massachusetts General Hospital; Harvard Medical School; Boston Massachusetts
6. Departments of Emergency Medicine, Psychiatry, and Quantitative Health Sciences; University of Massachusetts Medical School; Worcester Massachusetts