1. Tinsley Harrison Internal Medicine Residency Program, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, USA
2. Basil I. Hirschowitz Center of Endoscopic Excellence, Division of Gastroenterology and Hepatology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, USA
3. Division of Cardiovascular Disease, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, USA
4. Division of Cardiothoracic Surgery, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, USA