1. Department of Surgery, Division of Otolaryngology-Head and Neck Surgery; University of Calgary; Calgary Alberta Canada
2. The Department of Otolaryngology-Head and Neck Surgery; Oregon Health and Science University; Portland Oregon
3. Department of Otolaryngology and Communication Sciences; Medical College of Wisconsin; Milwaukee Wisconsin
4. Sinus and Skull Base Surgery Program, Division of Otolaryngology-Head and Neck Surgery, Department of Surgery; University of Utah; Salt Lake City Utah
5. Department of Otology and Laryngology
6. Department of Medicine; Georgetown University Hospital; Washington DC
7. Department of Otolaryngology; Harvard Medical School; Boston Massachusetts
8. Department of Otolaryngology; Massachusetts Eye and Ear Infirmary; Boston Massachusetts
9. Department of Otorhinolaryngology; Weill Medical College of Cornell University; New York City New York U.S.A