1. Center for Innovations in Quality, Effectiveness, and Safety, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas, USA
2. Section of Health Services Research, Departments of Medicine and Surgery, Baylor College of Medicine, Houston, Texas, USA
3. Veterans Affairs Maryland Health Care System, Baltimore, Maryland, USA
4. Division of Genomic Epidemiology and Clinical Outcomes, Department of Epidemiology and Public Health, University of Maryland, Baltimore, Baltimore, Maryland, USA