1. Department of Surgery, Division of Otolaryngology-Head and Neck Surgery; University of California-San Diego; San Diego California U.S.A.
2. Division of Rhinology and Sinus/Skull Base Surgery; Oregon Sinus Center, Department of Otolaryngology-Head and Neck Surgery, Oregon Health and Science University; Portland Oregon U.S.A.
3. Department of Otolaryngology-Head and Neck Surgery; Division of Rhinology and Anterior Skull Base, Emory University Hospital; Atlanta Georgia U.S.A.
4. Division of Otolaryngology-Head and Neck Surgery, Department of Surgery; University of Calgary; Calgary Alberta Canada
5. Division of Otolaryngology-Head and Neck Surgery, Rhinology-Sinus and Skull Base Surgery Program, Department of Surgery; University of Utah; Salt Lake City Utah U.S.A.