1 Inova Heart and Vascular Institute, Inova Fairfax Medical Campus, Falls Church, VA (S.S.S.).
2 Division of Cardiovascular Medicine, Department of Medicine, Duke University School of Medicine, Durham, NC (J.N.K.).
3 Levine Cardiac Intensive Care Unit, TIMI (Thrombolysis in Myocardial Infarction) study group, Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (D.A.M.).