1. Department of Pediatrics, University of Washington, Seattle, Washington
2. Present address: Department of Dermatology, Emory University School of Medicine, Atlanta, GA.
3. Department of Clinical Microbiology, Copenhagen CF Center, Copenhagen, Denmark
4. Department of Genome Sciences, University of Washington, Seattle, Washington
5. Present address: National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MA.
6. Departments of Medicine and Microbiology, University of Washington, Seattle, Washington
7. Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts
8. Department of Pediatrics, Harvard Medical School, Boston, Massachusetts