1 International Clinical Research Center, Departments of Global Health and Medicine, University of Washington, Seattle, WA 98104, USA; Vaccine and Infectious Diseases Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA. Electronic address: [email protected].
2 International Clinical Research Center, Departments of Global Health and Medicine, University of Washington, Seattle, WA 98104, USA; Department of Epidemiology, University of Washington, Seattle, WA, USA.