1. VA San Diego Healthcare System , San Diego, CA 92161, USA
2. Center of Excellence for Stress and Mental Health, VA San Diego Healthcare System , San Diego, CA 92161, USA
3. Department of Psychiatry, University of California San Diego , La Jolla, CA 92093, USA
4. Sam and Rose Stein Institute for Research on Aging, University of California San Diego , La Jolla, CA 92093, USA
5. SDSU/UC San Diego Joint Doctoral Program in Clinical Psychology , San Diego, CA 92182, USA
6. Academic Research Programs, IBM Research-Almaden , San Jose, CA 95120, USA