1. Departments of Internal Medicine and Health Management and Policy, Consortium for Health Outcomes, Innovation and Cost-Effectiveness Studies (CHOICES), The University of Michigan, Ann Arbor, Michigan
2. Department of Health Management and Policy, Consortium for Health Outcomes, Innovation and Cost-Effectiveness Studies (CHOICES), The University of Michigan, Ann Arbor, Michigan
3. Center for Practice Management and Outcomes Research, Ann Arbor VA Health Services Research & Development Field Program, Ann Arbor, Michigan