1. Department of Otolaryngology–Head and Neck Surgery West Virginia University School of Medicine Morgantown West Virginia U.S.A.
2. Department of Otolaryngology and Communication Sciences Medical College of Wisconsin Milwaukee Wisconsin U.S.A.
3. Department of Otolaryngology–Head and Neck Surgery University of Iowa Iowa City Iowa U.S.A.
4. Department of Otolaryngology–Head and Neck Surgery The Ohio State University Wexner Medical Center Columbus Ohio U.S.A.
5. Division of Otolaryngology–Head and Neck Surgery Brigham and Women's Hospital Boston Massachusetts U.S.A.
6. Department of Otolaryngology–Head and Neck Surgery Southern Illinois University Medical School Springfield Illinois U.S.A.
7. Department of Otolaryngology–Head and Neck Surgery and Department of Genetics Washington University School of Medicine St. Louis Missouri U.S.A.
8. Department of Otolaryngology, Head and Neck Surgery Massachusetts Eye and Ear Infirmary, Harvard Medical School Boston MA U.S.A.