1. Division of Neuroradiology, Department of Radiology, Mayo Clinic, 200 First Street Southwest, Rochester, Minnesota 55905, USA
2. Division of Audiology, Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic, 200 First Street Southwest, Rochester, Minnesota 55905, USA
3. Division of Medical Physics, Department of Radiology, Mayo Clinic, 200 First Street Southwest, Rochester, Minnesota 55905, USA
4. Department of Biomedical Statistics and Informatics, Mayo Clinic, 200 First Street Southwest, Rochester, Minnesota 55905, USA