1. Department of Health Services, University of Washington, Seattle, Washington.
2. Department of Medical Education and Biomedical Informatics, University of Washington, Seattle, Washington.
3. Department of Biobehavioral Nursing and Health Systems, University of Washington, Seattle, Washington.
4. University of Washington Medical Center, Seattle, Washington.
5. Department of Medicine, University of Washington, Seattle, Washington.
6. Group Health Research Institute, Group Health Cooperative, Seattle, Washington.