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