1. Center for Chronic Disease Outcomes Research, Minneapolis Veterans Affairs Health Care System, Minneapolis, Minnesota
2. Department of Medicine, University of Minnesota Medical School, Minneapolis
3. Division of Epidemiology, University of Minnesota School of Public Health, Minneapolis, Minneapolis, Minnesota
4. Center for Health Information and Communication, Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana
5. Department of Medicine, Indiana University School of Medicine, Indianapolis
6. Regenstrief Institute, Indianapolis, Indiana