1. Department of Veterans Affairs (VA) Health Services Research and Development Center for Comprehensive Access & Delivery Research and Evaluation (CADRE), Iowa City VA Medical Center, Iowa City, Iowa.
2. Iowa City Veterans Affairs Medical Center, Iowa City, Iowa.
3. Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, Iowa.
4. Division of General Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa.