1. Cardiovascular Division; Department of Medicine; Washington University School of Medicine; St. Louis Missouri
2. Missouri Hospital Association; Hospital Industry Data Institute; Jefferson City Missouri
3. Center for Health Policy and Health Services Research; Henry Ford Health System; Detroit Michigan
4. Division of Geriatrics; Department of Medicine; University of Wisconsin School of Medicine and Public Health, and Department of Veterans Affairs Geriatrics Research Education and Clinical Center; Madison Wisconsin
5. Department of Health Care Policy; Harvard Medical School; Boston Massachusetts
6. Division of General Medical Sciences; Department of Medicine; Washington University School of Medicine; St. Louis Missouri