1. Department of Otolaryngology–Head and Neck SurgeryThe Cleveland ClinicCleveland
2. Department of Otolaryngology–Head and Neck SurgeryVirginia MasonSeattle Washington U.S.A.
3. Divisions of Pediatric Otolaryngology–Head and Neck Surgery and Pulmonary MedicineCincinnati Children's Hospital Medical Center
4. Department of Otolaryngology–Head and Neck SurgeryUniversity of CincinnatiCincinnati Ohio