1. Oregon Sinus Center; Division of Rhinology and Sinus Surgery; Department of Otolaryngology-Head and Neck Surgery; Oregon Health and Science University; Portland Oregon
2. Division of Otolaryngology-Head and Neck Surgery; Department of Surgery; University of Calgary; Calgary Alberta Canada
3. Division of Rhinology and Sinus Surgery; Department of Otolaryngology-Head and Neck Surgery; Medical University of South Carolina; Charleston South Carolina
4. Division of Rhinology and Endoscopic Skull Base Surgery; Department of Otolaryngology-Head and Neck Surgery; Stanford University Medical Center; Stanford California
5. Division of Otolaryngology-Head and Neck Surgery; Department of Surgery; University of Utah School of Medicine; Salt Lake City Utah