1. Department of Communication Sciences and Disorders, East Carolina University, Greenville, North Carolina, USA
2. Department of Neurology, Emory University, Atlanta, Georgia, USA
3. VA Center for Visual and Neurocognitive Rehabilitation, Decatur, Georgia, USA
4. Department of Neurology, University of Florida Center for Movement Disorders and Neurorestoration, Gainesville, Florida, USA
5. VA Brain Rehabilitation Research Center, Gainesville, Florida, USA
6. Department of Neurosurgery, University of Florida Center for Movement Disorders and Neurorestoration, Gainesville, Florida, USA
7. Department of Communicative Disorders, University of Florida, Gainesville, Florida, USA
8. Department of Speech, Language and Hearing Sciences, Michigan State University, East Lansing, Michigan, USA