1. Department of Otorhinolaryngology; University of Pennsylvania; Philadelphia; PA
2. Department of Otolaryngology; Oregon Health and Science University; Portland; OR
3. Department of Otolaryngology; University of Pittsburgh; Pittsburgh; PA
4. Department of Otorhinolaryngology; University of Texas Medical School; Houston; TX
5. Department of Otolaryngology-Head and Neck Surgery; Weill Cornell Medical College; New York; NY
6. Department of Otolaryngology-Head and Neck Surgery; University of North Carolina; Chapel Hill; NC