1. The University of North Carolina at Chapel Hill, Gillings School of Global Public Health, Department of Epidemiology, Chapel Hill, NC
2. Medical College of Wisconsin, Department of Psychiatry and Behavioral Medicine, Center for AIDS Intervention Research, Milwaukee, WI
3. The University of North Carolina at Chapel Hill, School of Medicine, Departments of Emergency Medicine and Internal Medicine, Chapel Hill, NC
4. The University of North Carolina at Chapel Hill, School of Medicine, Center for Infectious Diseases, Chapel Hill, NC