[1] University of Iowa College of Medicine,Division of General Medicine, Department of Internal Medicine
[2] University of Michigan School of Medicine,Division of General Medicine, Department of Internal Medicine
[3] Ann Arbor Veterans Affairs Health Services Research and Development Field Program,Department of Epidemiology
[4] University of Iowa College of Public Health,Department of Health Management and Policy
[5] University of Michigan School of Public Health,Consortium for Health Outcomes, Innovation, and Cost Effectiveness Studies (CHOICES)
[6] University of Michigan School of Medicine,Division of General Medicine
[7] University of Iowa Hospitals and Clinics,undefined