1. Research Services, VA San Diego Healthcare System, San Diego, CA, USA
2. Psychology Service, VA San Diego Healthcare System, San Diego, CA, USA
3. University of California San Diego, School of Medicine, Department of Psychiatry, La Jolla, CA, USA
4. San Diego State University/University of California, San Diego (SDSU/UCSD), La Jolla, CA, USA
5. Department of Neuroscience, University of California, San Diego, La Jolla, CA, USA