1. Department of Otolaryngology; Massachusetts Eye and Ear Infirmary; Boston Massachusetts
2. Department of Otolaryngology; Harvard Medical School; Boston Massachusetts
3. Division of Otolaryngology-Head and Neck Surgery; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio U.S.A.
4. Division of Pulmonary Medicine; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio U.S.A.
5. Department of Otolaryngology-Head and Neck Surgery; University of Cincinnati College of Medicine; Cincinnati Ohio U.S.A.
6. Department of Otolaryngology and Communication Enhancement; Boston Children's Hospital
7. Division of Otolaryngology; Beth Israel Deaconess Medical Center; Boston Massachusetts