1. Departments of Pediatrics
2. Internal Medicine, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina
3. Department of Health Behavior and Health Education, University of North Carolina at Chapel Hill School of Public Health, Chapel Hill, North Carolina
4. University of Texas Health Science Center, San Antonio, Texas
5. Harvard Injury Control Research Center, Harvard School of Public Health, Boston, Massachusetts
6. Department of Biostatistics and Epidemiology and Firearm and Injury Center at Penn, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania