1. a Psychology and Research Services, VA San Diego Healthcare System (VASDHS) , San Diego, CA, USA
2. b Department of Psychiatry , University of California, San Diego , La Jolla, CA, USA
3. c Center of Excellence for Stress and Mental Health, VA San Diego Healthcare System (VASDHS) , San Diego, CA, USA
4. d Department of Behavioral Sciences , Rush University Medical Center , Chicago, IL, USA
5. e Neurosciences Department , Defense and Veterans Brain Injury Center, Naval Medical Center , San Diego, CA, USA