1. Department of Health Behavior, Gillings School of Global Public Health, UNC-Chapel Hill, NC, USA
2. Brown School, Washington University in St. Louis, St. Louis, MO, USA
3. Division of Infectious Diseases, John T. Milliken Department of Medicine, Washington University in St. Louis, St. Louis, MO, USA
4. Department of Epidemiology, Gillings School of Global Public Health, UNC-Chapel Hill, Chapel Hill, NC, USA
5. Division of General Medicine and Clinical Epidemiology, School of Medicine, UNC-Chapel Hill, NC, USA