1. Department of Communication Sciences and Disorders, Arnold School of Public Health, University of South Carolina
2. Division of Neurosurgery and The Mental Retardation Research Center, University of California, Los Angeles,
3. Brain Mapping Center, David Geffen School of Medicine (SB) at UCLA, University of California, Los Angeles
4. Department of Neurology, Neurologic Rehabilitation and Research Program, University of California, Los Angeles