1. Department of Community Medicine, West Virginia University, Morgantown, WV, USA
2. West Virginia University Injury Control Research Center, Morgantown, WV, USA
3. Department of Community and Family Medicine, Duke University, Durham, NC, USA
4. Department of Epidemiology, University of Colorado, Aurora, CO, USA
5. Department of Community and Behavioral Health, University of Colorado, Aurora, CO, USA
6. Department of Sociology and Anthropology, North Carolina State University, Raleigh, NC, USA