1. From the Department of Radiology (N.K., S.E.S., I.K.I., R.K.), Center for Evidence Based Imaging (N.K., S.E.S., I.K.I., R.K.), and Department of Medicine (I.K.I.), Brigham and Women’s Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02115, and Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, Mass (D.M.B.).