1. 1Department of Anesthesiology, Cardiothoracic Anesthesiology Division, Duke University Medical Center, Durham, North Carolina.
2. 2Department of Cardiothoracic Surgery, Duke University Medical Center, Durham, North Carolina.
3. 3Department of Anesthesiology, Hôpital Foch, Suresnes, France.
4. 4Department of Pathology, Duke University Medical Center, Durham, North Carolina.
5. 5Department of Anesthesiology, Cardiothoracic Anesthesiology Division, Duke University Medical Center, Durham, North Carolina.