1. Department of Epidemiology, Fielding School of Public Health, University of California, Los Angeles
2. California Center for Population Research, University of California, Los Angeles
3. School of Nursing, University of California, San Francisco
4. Department of Psychiatry & Behavioral Sciences, University of California, San Francisco
5. Department of Neurology, University of California, San Francisco
6. Department of Epidemiology & Biostatistics, University of California, San Francisco
7. San Francisco Veterans Affairs Health Care System, San Francisco, California