1. Division of Pulmonary, Allergy and Critical Care, Columbia University Irving Medical Center, New York, New York, USA
2. Division of Pulmonary and Critical Care, Maine Medical Center, Portland, Maine, USA
3. Department of Microbiology and Medicine, University of Washington, Seattle, Washington, USA
4. Gilead Sciences, Inc., Seattle, Washington, USA
5. Gilead Sciences, Inc., Foster City, California, USA
6. Cystic Fibrosis Foundation, Bethesda, Maryland, USA
7. Department of Pediatrics, Columbia University Irving Medical Center, New York, New York, USA