1. Division of Neurovascular; Department of Neurology; University of California, San Francisco; San Francisco California
2. Department of Medicine; University of Pittsburgh; Pittsburgh Pennsylvania
3. Division of Geriatrics; Department of Medicine; University of California, San Francisco; San Francisco California
4. Department of Epidemiology and Biostatistics; University of California, San Francisco; San Francisco California
5. Division of Geriatrics; Department of Medicine; University of California, San Francisco; San Francisco Veterans Affairs Medical Center; San Francisco California