1. Division of Rhinology and Sinus/Skull Base Surgery, Oregon Sinus Center, Department of Otolaryngology-Head and Neck Surgery; Oregon Health and Science University; Portland OR
2. Division of Rhinology and Sinus Surgery; Department of Otolaryngology-Head and Neck Surgery, Medical University of South Carolina; Charleston SC
3. Division of Otolaryngology-Head and Neck Surgery; Department of Surgery, University of Calgary; Calgary Alberta Canada