1. Department of Pediatrics, University of Washington School of Medicine, Seattle, Washington;
2. Department of Pediatrics, Seattle Children’s Research Institute, Seattle, Washington;
3. Department of Pediatrics, University of North Carolina School of Medicine, Chapel Hill, North Carolina;
4. Department of Pediatrics, Children’s Hospital Colorado, University of Colorado School of Medicine, Aurora, Colorado;
5. Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada;
6. Department of Pediatrics, Stanford University, Palo Alto, California;
7. Department of Pediatrics, McGill University Health Centre Research Institute, Montreal, Quebec, Canada;
8. Pulmonary Medicine Division,
9. Department of Pathology and Laboratory Medicine, Marsico Lung Institute, and
10. Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri; and
11. Department of Pediatric Pulmonology and Allergology, Sophia Children’s Hospital, and
12. Department of Pediatric Pulmonology and Allergology, Department of Radiology and Nuclear Medicine, Erasmus Medical Center, Rotterdam, the Netherlands