1. a Department of Mental Health and Behavioral Sciences , James A. Haley VAMC , Tampa, FL, USA
2. b Defense and Veterans Brain Injury Center , Tampa, FL, USA
3. c Department of Psychiatry and Behavioral Medicine , University of South Florida , Tampa, FL, USA
4. d Department of Psychology , University of South Florida , Tampa, FL, USA
5. e Ribopharm, Inc. , Washington, DC, USA