1. From the Cardiovascular Division (J.N.C.), Department of Medicine, University of Minnesota Medical School, Minneapolis, Minn; the Division of Cardiology (A.A.Q.), Department of Medicine, Emory University School of Medicine, Atlanta, Ga; the Radiology Department (N.K.H.), Brigham and Women’s Hospital, Boston, Mass; and the Department of Internal Medicine (K.A.J.), University of Michigan Health System, Ann Arbor, Mich.