| Affiliation: | 1. Department of Otolaryngology—Head and Neck Surgery, University of Pittsburgh Medical Center, , Pittsburgh, Pennsylvania, U.S.A.;2. Departments of Radiology and Otolaryngology, University of Pittsburgh Medical Center, , Pittsburgh, Pennsylvania, U.S.A.;3. Division of Pediatric General and Thoracic Surgery, Children's Hospital of Pittsburgh, University of Pittsburgh Medical Center, , Pittsburgh, Pennsylvania, U.S.A.;4. Department of Pediatric Otolaryngology, Children's Hospital of Pittsburgh, University of Pittsburgh Medical Center, , Pittsburgh, Pennsylvania, U.S.A. |
