1. Department of Otolaryngology—Head and Neck Surgery University of Washington Seattle Washington U.S.A.
2. Department of Otolaryngology—Head and Neck Surgery Johns Hopkins University School of Medicine Baltimore Maryland U.S.A.
3. Division of Otolaryngology—Head and Neck Surgery, Department of Surgery University of California San Diego La Jolla California U.S.A.
4. Department of Otolaryngology—Head and Neck Surgery Harvard Medical School Boston Massachusetts U.S.A.
5. Department of Otolaryngology—Head and Neck Surgery Massachusetts Eye and Ear Boston Massachusetts U.S.A.
6. Division of Otolaryngology—Head and Neck Surgery Brigham and Women's Hospital Boston Massachusetts U.S.A.
7. Center for Surgery and Public Health Brigham and Women's Hospital Boston Massachusetts U.S.A.