1. Department of Pediatrics, Riley Hospital for Children at Indiana University Health, Indianapolis, Indiana
2. Department of Pediatrics, Lucile Packard Children's Hospital, Stanford University, Stanford, California
3. Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas
4. Department of Pediatrics, Seattle Children's Hospital, University of Washington School of Medicine, Seattle, Washington
5. Department of Pediatrics-Pulmonary Medicine, University of Colorado, Denver, Colorado
6. Eudowood Division of Pediatric Respiratory Sciences, Johns Hopkins University, Baltimore, Maryland
7. Department of Pediatrics, Arkansas Children's Hospital, Little Rock, Arkansa
8. Department of Pediatrics, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, Pennsylvania
9. Division of Pulmonary Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts
10. Department of Pediatrics, Women and Infants Hospital, The Warren Alpert Medical School, Brown University, Providence, Rhode Island
11. Department of Pediatrics, Intermountain Primary Children's Hospital, University of Utah, Salt Lake City, Utah
12. Division of Pediatric Allergy, Immunology, and Pulmonary Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
13. Division of Neonatology, Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden
14. Department of Pediatrics, Children's Mercy Hospitals and Clinics, University of Missouri-Kansas City School of Medicine, Kansas City, Missouri
15. Department of Pediatrics, Nationwide Children's Hospital, The Ohio State University, Columbus, Ohio