1. Los Angeles, California, and Boston, Massachusetts
2. Division of Head and Neck Surgery (Drs Hill and Shapiro), University of California at Los Angeles Medical School
3. Division of Otolaryngology, Brigham & Women's Hospital, and the Department of Otology and Laryngology, Harvard Medical School.
4. Department of Radiology (Drs Hall and Lufkin), University of California at Los Angeles Medical School