1. Vaccine and Infectious Diseases Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA.
2. Department of Medicine, Emory University, Atlanta, GA, USA.
3. Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, USA.
4. Department of Immunology and Microbiology, Scripps Research Institute, Florida Campus, Jupiter, FL, USA.
5. Department of Medicine, University of Washington, Seattle, WA, USA.
6. Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA.