1. Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC
2. Department of Health Behavior, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC
3. Department of Family Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC
4. North Carolina Department of Health and Human Services, Division of Public Health, Tobacco Prevention and Control Branch Raleigh, NC