1. Center for Health Equity Research, School of Medicine, The University of North Carolina Chapel Hill, Chapel Hill, NC, USA
2. Gillings School of Global Public Health, The University of North Carolina Chapel Hill, Chapel Hill, NC, USA
3. Department of Medicine, School of Medicine, The University of North Carolina Chapel Hill, Chapel Hill, NC, USA
4. Abacus Evaluation, School of Medicine, The University of North Carolina Chapel Hill, Chapel Hill, NC, USA
5. University of Nebraska Medical Center College of Public Health, Omaha, NE, USA
6. Department of Social Medicine, School of Medicine, The University of North Carolina Chapel Hill, Chapel Hill, NC, USA