| Institution: | 1. Department of Otolaryngology – Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa;2. Department of Otolaryngology – Head and Neck Surgery, University of Nebraska, Omaha, Nebraska;3. Department of Otolaryngology – Head and Neck Surgery, University of Missouri, Columbia, Missouri;4. Department of Otolaryngology – Head and Neck Surgery, University of Kansas, Kansas City, Kansas;5. Department of Otolaryngology – Head and Neck Surgery, University of Minnesota, Minneapolis, Minnesota;6. The Sanford Clinic, Sioux Falls, South Dakota |
