1 Division of Cardiac Anesthesiology, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital, Boston, Mass. Electronic address: mdambra@partners.org.
2 Chief of Perfusion, Brigham and Women's Hospital, Boston, Mass.
3 Transfusion Medicine Service, Department of Pathology, Brigham and Women's Hospital, Boston, Mass.
4 Division of Cardiac Surgery, Department of Surgery, Brigham and Women's Hospital, Boston, Mass.