1. Division of Allergy and Infectious Disease, Department of Medicine, University of Washington, Seattle, WA, USA
2. HIV/STD Program, Public Health–Seattle and King County, Seattle, WA, USA
3. Department of Epidemiology, University of Washington, Seattle, WA, USA
4. Division of HIV/AIDS Prevention, National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA
5. Department of Global Health, University of Washington, Seattle, WA, USA