1 Department of Communication Sciences & Disorders, University of South Carolina, USA. Electronic address: jfridrik@sc.edu.
2 Department of Communication Sciences & Disorders, University of South Carolina, USA.
3 Department of Psychology, University of South Carolina, USA.
4 Department of Public Health Sciences, Medical University of South Carolina, USA.
5 Department of Psychiatry, Medical University of South Carolina, USA; Department of Neurology, Medical University of South Carolina, USA; Ralph H. Johnson VA Medical Center, Charleston, USA.
6 Department of Neurology, University of South Carolina, USA.
7 Department of Neurology, Medical University of South Carolina, USA.