1. Division of Cardiovascular Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
2. Division of Cardiac Surgery, Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
3. Department of Biostatistics, Vanderbilt University Medical Center, Nashville, Tennessee
4. University of Vermont Medical Center, Burlington
5. Measurement Science Quality Enhancement Research Initiative, Department of Veterans Affairs, San Francisco, California
6. Department of Biomedical Informatics, Vanderbilt University Medical Center, Nashville, Tennessee