1. Division of Otolaryngology-Head and Neck Surgery; Department of Surgery; University of Calgary; Calgary Alberta Canada
2. Division of Rhinology and Sinus Surgery; Department of Otolaryngology-Head and Neck Surgery; Medical University of South Carolina; Charleston South Carolina
3. Division of Rhinology and Sinus Surgery; Oregon Sinus Center; Department of Otolaryngology-Head and Neck Surgery; Oregon Health and Science University; Portland Oregon U.S.A