1. Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine (T.T., T.O.Y., J.H.), Yale University School of Medicine, New Haven, CT.
2. Section of Critical Care, Department of Pediatrics (E.V.S.F.), Yale University School of Medicine, New Haven, CT.
3. Yale Cooperative Center of Excellence in Hematology (J.H.), Yale University School of Medicine, New Haven, CT.