1. Northwest Center for Outcomes Research in Older Adults; VA Puget Sound Health Care System; Seattle WA USA
2. Department of Health Services; University of Washington; Seattle WA USA
3. Division of Health Policy and Management, School of Public Health; University of Minnesota; Minneapolis MN USA
4. Center for Health Services Research in Primary Care; Durham VA Medical Center; Durham NC USA
5. Division of General Internal Medicine, Department of Medicine; Duke University; Durham NC USA