1. Department of Otorhinolaryngology and Mayo Clinic Children's Center; Rochester Minnesota
2. Department of Otolaryngology-Head and Neck Surgery; Stanford University; Palo Alto California
3. Division of Otolaryngology, Children's National Health System; Washington DC
4. Department of Pediatric Surgery; General Hospital of Children Pedro de Elizalde; Buenos Aires Argentina
5. Department of Pediatric and Adolescent Medicine and Mayo Clinic Children's Center; Mayo Clinic; Rochester Minnesota
6. Department of Otorhinolaryngology; University of Ottawa; Ottawa
7. Department of Pediatrics; University of Arizona Health Sciences; Tucson Arizona
8. Division of Pediatric Otolaryngology and Aerodigestive and Esophageal Center; Cincinnati Children's Hospital Medical Center and University of Cincinnati College of Medicine; Cincinnati Ohio
9. Department of Otorhinolaryngology; Hôpital Universitaire Necker-Enfants Malades; Paris France
10. Department of Otolaryngology, Head and Neck Surgery; Northwestern University Feinberg School of Medicine; Chicago Illinois
11. Section of Pediatric Cardiothoracic Surgery; St. Louis Children's Hospital and Washington University School of Medicine; St. Louis Missouri
12. Department of Pediatric Otolaryngology; Texas Children's Hospital; Houston Texas
13. Department of Otolaryngology, Head and Neck Surgery; University Hospital of Lausanne (CHUV); Lausanne Switzerland
14. Department of Otolaryngology; University of Colorado; Aurora Colorado
15. Department of Otolaryngology-Head & Neck Surgery, Hospital for Sick Children; University of Toronto; Toronto Ontario Canada
16. Department of Otolaryngology; Boston Children's Hospital, Harvard Medical School; Boston Massachusetts
17. Department of Paediatric Otolaryngology; Our Lady's Hospital for Sick Children; Dublin Ireland
18. Airway Team and Surgical Department; Instituto Giannina Gaslini; Genoa Italy
19. Pediatric Surgery Department; University of Chile, Clinical Las Condes Medical Center; Santiago Chile
20. Department of Otolaryngology, Head and Neck Surgery; Princess Margaret Hospital for Children; Perth Australia
21. Department of Otolaryngology-Head and Neck Surgery; Medical University of South Carolina; Charleston South Carolina
22. University of Arkansas School for Medical Sciences; Department of Otolaryngology-Head & Neck Surgery, Arkansas Children's Hospital; Little Rock Arkansas
23. Division of Pulmonary Medicine, Cincinnati Children's Hospital; Cincinnati Ohio
24. Monroe Carell Jr. Children's Hospital at Vanderbilt; Nashville Tennessee
25. Center for Pediatric Airway Disorders, Children's Hospital of Philadelphia, Perelman School of Medicine; University of Pennsylvania; Philadelphia Pennsylvania U.S.A.