1. San Francisco Veterans Affairs Medical Center, San Francisco, CA, USA
2. Department of Psychiatry, University of California San Francisco (UCSF), San Francisco, CA, USA
3. Northern California Institute for Research and Education, San Francisco, CA, USA
4. Department of Neurology, UCSF, San Francisco, CA, USA
5. Department of Epidemiology & Biostatistics, UCSF, San Francisco, CA, USA