1. Department of Otolaryngology-Head and Neck Surgery; University of California; Irvine; Irvine; CA
2. Division of Rhinology and Sinus Surgery; Oregon Sinus Center; Department of Otolaryngology-Head and Neck Surgery; Oregon Health and Science University; Portland; OR
3. Department of Otorhinolaryngology-Head and Neck Surgery; University of Pennsylvania; Philadelphia; PA