1. Eaton-Peabody Laboratory, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts;
2. Harvard-Massachusetts Institute of Technology Division of Health Sciences and Technology, Speech and Hearing Bioscience and Technology Program, Cambridge, Massachusetts;
3. Audiology Department, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts;
4. Department of Otology and Laryngology, Harvard Medical School, Boston, Massachusetts;
5. Department of Otolaryngology, Kangwon National University Hospital, Chuncheon, South Korea; and
6. Neurology Service, Massachusetts General Hospital, Boston, Massachusetts