1. Department of Neurology; Johns Hopkins University School of Medicine; Baltimore MD
2. Department of Physical Medicine and Rehabilitation; Johns Hopkins University School of Medicine; Baltimore MD
3. Department of Otolaryngology and Head & Neck Surgery; Johns Hopkins University School of Medicine; Baltimore MD
4. Department of Cognitive Science; Johns Hopkins University School of Medicine; Baltimore MD
5. Department of Neurology; Medical University of South Carolina; Charleston SC
6. Department of Communication Sciences and Disorders; University of South Carolina; Columbia SC