1. Center for Communication Science, RTI International, Research Triangle Park, North Carolina, USA;
2. Department of Medicine, Duke University, Durham, North Carolina, USA
3. Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA;
4. School of Health and Applied Human Sciences, University of North Carolina, Wilmington, North Carolina, USA;
5. Department of Family Medicine and Community Health, Duke University, Durham, North Carolina, USA;,
6. Duke Clinical and Translational Science Institute, Duke University, Durham, North Carolina, USA