1. Department of Psychiatry, University of Colorado School of Medicine, Aurora,USA
2. Research and Development Service, Tuscaloosa VA Medical Center, Tuscaloosa, AL, USA
3. Department of Psychology, University of Alabama, Tuscaloosa, AL, USA
4. Alabama Research Institute on Aging, University of Alabama, Tuscaloosa, AL, USA
5. Department of Psychology and Neuroscience, University of Colorado, Boulder, CO, USA
6. Cancer Prevention and Control, University of Colorado Cancer Center, Aurora, CO, USA