1. Department of Otolaryngology-Head and Neck Surgery; Cleveland Clinic; Cleveland Ohio
2. Department of Otolaryngology-Head and Neck Surgery; Virginia Mason Medical Center; Seattle Washington
3. Division of Pediatric Otolaryngology-Head and Neck Surgery; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio
4. Division of Pulmonary Medicine; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio
5. Department of Otolaryngology-Head and Neck Surgery; University of Cincinnati; Cincinnati Ohio
6. Department of Otolaryngology; Harvard Medical School; Boston Massachusetts U.S.A.