1Department of Psychiatry & Center for Behavior Genetics of Aging, University of California San Diego, La Jolla, CA, USA
2Department of Epidemiology & Biostatistics, St. Louis University, St. Louis, MO, USA
3Department of Psychology, San Diego State University, San Diego, CA, USA
4Department of Radiology, University of California, San Diego, La Jolla, CA, USA
5Center of Excellence for Stress and Mental Health, VA San Diego Healthcare System, USA
6Department of Psychiatry & Behavioral Neuroscience, University of Chicago, Chicago, IL, USA
7Department of Psychological and Brain Sciences, Boston University, Boston, MA, USA
8Department of Psychology, University of California Riverside, Riverside, CA, USA