1. Department of Biomedical Informatics & Medical Education, University of Washington, Seattle, WA, USA
2. Group Health Research Institute, Group Health Cooperative, Seattle, WA, USA
3. Department of Surgery, University of Washington, Seattle, WA, USA
4. Departments of Biobehavioral Nursing and Health Systems, and Biomedical Informatics & Medical Education, University of Washington, Seattle, WA, USA
5. Information School and Department of Biomedical Informatics & Medical Education, University of Washington, Seattle, WA, USA