1. Sierra Pacific Mental Illness Research Education and Clinical Centers, VA Palo Alto Health Care System, Palo Alto, California, USA
2. Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, California, USA
3. School of Psychology, University of Queensland, Brisbane, Australia
4. Pacific Graduate School of Psychology, Palo Alto University, Palo Alto, California, USA
5. Behavioral Medicine Department, Psychology Service, VA Palo Alto Health Care System, Palo Alto, California, USA
6. Geriatric Research, Education, and Clinical Center, VA Palo Alto Health Care System, Palo Alto, California, USA