1. Division of Cardiovascular Medicine, University of Kentucky, Lexington, Kentucky, United States
2. Department of Internal Medicine, University of Louisville, Louisville, Kentucky, United States
3. Division of Cardiovascular Medicine, University of Buffalo, Buffalo, New York, United States
4. Department of Cardiovascular and Thoracic Surgery, University of Louisville, Louisville, Kentucky, United States
5. Division of Cardiovascular Medicine, University of Louisville, Louisville, Kentucky, United States
6. Division of Cardiovascular Medicine, Department of Internal Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, United States