1. School of Medicine, Duke University Medical Center, Durham, North Carolina.
2. Division of Cardiothoracic Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina.
3. Division of Cardiothoracic Anesthesiology, Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina.
4. Division of Cardiology, Department of Medicine, Duke University Medical Center, Durham, North Carolina.
5. Division of Acute Care Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina.