1. Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
2. Department of Medicine, Infectious Diseases Service, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
3. Infectious Disease and Hospital Epidemiology Division, University Hospital Basel, Basel, Switzerland
4. Department of Medicine, University of Washington, Seattle, Washington, USA
5. Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA