1. Division of General Internal Medicine, Department of Medicine, University of California, San Francisco
2. Medical Service, San Francisco Veterans Affairs Medical Center, San Francisco, California
3. Northern California Institute of Research and Education, San Francisco
4. Department of Neurology, University of California, Los Angeles
5. VA Greater Los Angeles Healthcare System, Los Angeles, California
6. Department of Internal Medicine, Indiana University School of Medicine, Indianapolis
7. Department of Neurology, Indiana University School of Medicine, Indianapolis
8. Health Services Research and Development, Center for Health Information and Communication, Richard L. Roudebush VA Medical Center, Department of Veterans Affairs, Indianapolis, Indiana
9. Division of General Internal Medicine, UT Southwestern Medical Center, Dallas, Texas
10. Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada
11. Visiting Scholar, Department of Medicine, University of California, San Francisco
12. Department of Surgery, University of Nebraska, Omaha
13. Omaha VA Medical Center, Omaha, Nebraska