1. Division of Cardiothoracic Surgery, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, Texas2Division of Cardiothoracic Surgery, Department of Surgery, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas
2. Division of Cardiothoracic Surgery, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, Texas2Division of Cardiothoracic Surgery, Department of Surgery, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas3Departme
3. Department of Cardiothoracic Surgery, University of Alabama and Birmingham Veterans Medical Center, Birmingham