| Affiliation: | 1. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina;2. Injury Prevention Research Center, University of North Carolina, Chapel Hill, North Carolina;3. Department of Medicine, University of California, San Francisco, California;4. Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, Iowa;5. Injury Prevention Research Center, University of Iowa, Iowa City, Iowa |
