1. Department of Pediatrics, University of Washington, Seattle, Washington, USA
2. Department of Pediatric Infectious Diseases, University of Washington School of Medicine, and Seattle Children's Research Institute, Seattle, Washington, USA
3. Department of Obstetrics & Gynecology, University of Washington, Seattle, Washington, USA
4. Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
5. Department of Comparative Medicine, University of Washington, Seattle, Washington, USA