1. Center for Health Research; Kaiser Permanente Northwest; Portland Oregon
2. Departments of Psychiatry, Neurology, and Epidemiology and Biostatistics; University of California San Francisco School of Medicine and San Francisco VA Medical Center; San Francisco California
3. Department of Medicine; University of Minnesota; University of Epidemiology & Community Health; Center for Chronic Disease Outcomes Research; VA Health Care System; Minneapolis Minnesota
4. Department of Epidemiology; Graduate School of Public Health; University of Pittsburgh; Pittsburgh Pennsylvania
5. Research Institute; California Pacific Medical Center; San Francisco California
6. Center for Health Research; Kaiser Permanente Hawaii; Honolulu Hawaii