1. Department of Epidemiology, Health Sciences Building, University of Washington, Seattle, Washington, USA.
2. Firearm Injury Policy and Research Program, School of Medicine, University of Washington, Seattle, Washington, USA.
3. Department of Surgery, Harborview Medical Center, University of Washington, Seattle, Washington, USA
4. Department of Health Behavior and Health Education, School of Public Health, University of Michigan, Ann Arbor, Michigan, USA.
5. Department of Pediatrics, University of Washington, Seattle, Washington, USA.