1. Seattle Children’s Research Institute, University of Washington, Seattle, WA 98101, USA
2. Department of Pediatrics, University of Washington, Seattle, WA 98105, USA
3. Department of Global Health, University of Washington, Seattle, WA 98195, USA
4. Department of Microbiology, University of Washington, Seattle, WA 98195, USA
5. Department of Medicine, University of Washington, Seattle, WA 98195, USA
6. Department of Epidemiology, University of Washington, Seattle, WA 98195, USA
7. Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA