1. Department of Head and Neck Surgery; University of California, Los Angeles; Los Angeles
2. Department of Otolaryngology; University of Colorado; Aurora Colorado
3. Division of Otolaryngology; University of Alabama, Birmingham; Birmingham Alabama
4. Department of Otorhinolaryngology-Head and Neck Surgery; Hospital of the University of Pennsylvania; Philadelphia Pennsylvania
5. Department of Head and Neck Surgery; Stanford University; Stanford California
6. Department of Otolaryngology-Head and Neck Surgery; University of Toronto; Toronto Ontario Canada
7. Division of Otolaryngology; University of Arizona; Tucson Arizona U.S.A.