1. Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
2. Department of Global Health, University of Washington, Seattle, WA, USA
3. Ministry of Health, Nairobi, Kenya
4. United States Agency for International Development, Nairobi, Kenya
5. PATH, Nairobi, Kenya
6. PATH, Seattle, WA, USA
7. PATH, Kisumu, Kenya