1. Division of Pediatric Otolaryngology-Head and Neck Surgery; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio U.S.A.
2. Department of Otolaryngology-Head and Neck Surgery; University of Cincinnati College of Medicine; Cincinnati Ohio U.S.A.
3. Aerodigestive and Esophageal Center; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio U.S.A.
4. Department of Otolaryngology-Head and Neck Surgery; Montreal Children's Hospital, McGill University Health Centre; Montreal Quebec Canada
5. Department of Otolaryngology-Head and Neck Surgery; University of Washington School of Medicine and Seattle Children's Hospital; Seattle Washington U.S.A.
6. Department of Otorhinolaryngology; Mayo Clinic College of Medicine; Rochester Minnesota U.S.A.
7. Division of Pediatric Otolaryngology; Oregon Health & Science University Doernbecher Children's Hospital, Oregon Health and Science University; Portland Oregon U.S.A.
8. Department of Otolaryngology-Head and Neck Surgery; Division of Pediatric Otolaryngology, Lucile Packard Children's Hospital Stanford, Stanford University School of Medicine; Stanford California U.S.A.