1. Department of Epidemiology Gillings School of Global Public Health, UNC Chapel Hill Chapel Hill North Carolina USA
2. Carolina Population Center UNC Chapel Hill Chapel Hill North Carolina USA
3. Department of Biostatistics Gillings School of Global Public Health, UNC Chapel Hill Chapel Hill North Carolina USA
4. NoviSci Durham North Carolina USA
5. Department of Population Health Sciences Duke University Durham North Carolina USA
6. Department of Sociology Duke University Durham North Carolina USA
7. Division of Infectious Diseases, Department of Medicine UNC Chapel Hill Chapel Hill North Carolina USA