1. Health Policy, Quality and Informatics Program, Michael E. DeBakey Veterans Affairs Medical Center Health Services Research and Development Center for Innovations, Houston, TX (S.S.V.).
2. Section of Cardiovascular Research, Department of Medicine, Baylor College of Medicine, Houston, TX (S.S.V.).
3. Division of Cardiology, McAllister Heart Institute, University of North Carolina at Chapel Hill (S.C.S.).
4. Northwestern University Feinberg School of Medicine, Chicago, IL (M.J.S.).
5. University of Texas Southwestern Medical Center and VA Medical Center, Dallas (S.M.G.).