1. Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, Washington, USA
2. Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, Washington, USA
3. Institut für Virologie, Freie Universität Berlin, Berlin, Germany
4. Department of Microbiology, Faculty of Science, Mahidol University, Bangkok, Thailand
5. Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA
6. Clinical Research Division, Fred Hutchinson Cancer Center, Seattle, Washington, USA
7. Department of Pediatrics, University of Washington, Seattle, Washington, USA