1. Rochester, Minnesota, Ann Arbor, Michigan, Cleveland, Ohio, and Seattle, Washington
2. Department of Otolaryngology, Mayo Clinic, Rochester
3. Department of Biostatistics, University of Michigan
4. Department of Otolaryngology-Head and Neck Surgery, University of Washington
5. Department of Pathology, University of Michigan
6. Department of Otolaryngology-Head and Neck Surgery, University of Michigan
7. Department of Otolaryngology and Communicative Disorders, Cleveland Clinic Foundation, University of Michigan