1. Department of Otolaryngology-Head and Neck Surgery, University of Nebraska, Omaha, Nebraska, USA
2. Midwest Head and Neck Cancer Consortium, USA
3. Department of Surgery, University of Minnesota, Minneapolis, Minnesota, USA
4. Department of Otolaryngology-Head and Neck Surgery, University of Kansas, Lawrence, Kansas, USA
5. Department of Otolaryngology-Head and Neck Surgery, University of Missouri, Columbia, Missouri, USA
6. Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa, USA
7. Department of Surgery, Sanford/University of South Dakota, Vermillion, South Dakota, USA