1. Department of Medicine, University of Washington , Seattle, Washington , USA
2. Department of Radiology, University of Washington , Seattle, Washington , USA
3. Department of Medicine, Oregon Health & Science University , Portland, Oregon , USA
4. GRECC, VA Puget Sound Health Care System , Seattle, Washington, USA
5. Department of Biostatistics, University of Washington , Seattle, Washington , USA
6. Departments of Family Medicine, Epidemiology, and Global Health, University of Washington , Seattle, Washington , USA
7. Department of Medicine, University of California San Francisco , San Francisco, California , USA
8. Departments of Psychiatry, Neurology, and Epidemiology and Biostatistics, University of California San Francisco , San Francisco, California , USA
9. California Pacific Medical Center Research Institute, and University of California San Francisco , San Francisco, California , USA