1. Department of Social and Behavioral Sciences, Harvard T. H. Chan School of Public Health, Boston, Massachusetts, USA;
2. Harborview Injury Prevention & Research Center, University of Washington School of Medicine, Seattle, Washington, USA;
3. Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, Massachusetts, USA;
4. The Chester M. Pierce, MD Division of Global Psychiatry, Massachusetts General Hospital, Boston, Massachusetts, USA;
5. Department of Psychiatry, Harvard Medical School, Boston, Massachusetts, USA;
6. Saving Promise, Washington, District of Columbia, USA;
7. Division of Violence Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, USA