1. Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, Nashville, TN
2. Department of Psychiatry and Psychology, Mayo Clinic, Rochester, MN
3. Department of Otorhinolaryngology—Head and Neck Surgery, Mayo Clinic, Rochester, MN
4. Department of Neurology, Mayo Clinic, Rochester, MN
5. Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN
6. Department of Otolaryngology—Head and Neck Surgery, University of Michigan, Ann Arbor