1. University of North Carolina Injury Prevention Research Center, Chapel Hill, North Carolina
2. Departments of Health Behavior and Health Education
3. Department of Pediatrics, University of North Carolina School of Medicine, Chapel Hill, North Carolina
4. Epidemiology
5. Department of Sociology and Anthropology, North Carolina State University, Raleigh, North Carolina
6. Biostatistics, University of North Carolina School of Public Health, Chapel Hill, North Carolina