1. Department of Epidemiology, University of Washington, Seattle, Washington.
2. Division of Infectious Diseases, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi.
3. Department of Population Health Sciences, University of Mississippi Medical Center, Jackson, Mississippi.
4. Department of Global Health, University of Washington, Seattle, Washington.
5. HIV/STD Office, Mississippi State Department of Health, Jackson, Mississippi.
6. Department of Medicine, University of Washington, Seattle, Washington.
7. HIV/STD Program, Public Health—Seattle and King County, Seattle, Washington.