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
3. Division of Rhinology and Sinus Surgery, Oregon Sinus Center, Department of Otolaryngology–Head and Neck Surgery, Oregon Health and Science University, Portland
4. Division of Otolaryngology–Head and Neck Surgery, Department of Surgery, University of California, San Diego