1. Department of Epidemiology, University of Washington, Seattle, USA
2. Paul G. Allen School for Global Animal Health, Washington State University, Pullman, USA
3. Department of Pediatrics, University of Washington, Seattle, USA
4. Department of Global Health, University of Washington, Seattle, USA
5. Department of Allergy and Infectious Disease, University of Washington, Seattle, USA
6. Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, USA