1. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill , Chapel Hill, NC, USA
2. Department of Social Sciences and Health Policy, Wake Forest University School of Medicine , Winston-Salem, NC, USA
3. Department of Health Policy and Management, Gillings School of Global Public Health, University of North Carolina at Chapel Hill , Chapel Hill, NC, USA
4. Lineberger Comprehensive Cancer Center , Chapel Hill, NC, USA