[1] Univ South Carolina, Dept Commun Sci & Disorders, Columbia, SC 29208 USA
[2] Univ South Carolina, Dept Psychol, Columbia, SC 29208 USA
[3] Med Univ South Carolina, Dept Publ Hlth Sci, Charleston, SC 29425 USA
[4] Med Univ South Carolina, Dept Psychiat, Charleston, SC 29425 USA
[5] Med Univ South Carolina, Dept Neurol, Charleston, SC 29425 USA
[6] Ralph H Johnson VA Med Ctr, Charleston, SC USA
[7] Univ South Carolina, Dept Neurol, Columbia, SC 29208 USA