1. Mental Health, VA San Diego Medical Center, San Diego, California, USA.
2. Center of Excellence for Stress and Mental Health, San Diego, California, USA.
3. Department of Psychiatry, University of California-San Diego, San Diego, California, USA.
4. Department of Psychology, West Virginia University, Morgantown, West Virginia, USA.
5. Injury and Recovery Laboratory, Department of Neuroscience, Ohio State University, Columbus, Ohio, USA.