1. From the Noninvasive Cardiovascular Imaging Program, Department of Medicine and Radiology (S.L.P., B.Z., R.P.D., R.Y.K., R.B.), and Division of Cardiovascular Medicine, Department of Medicine (B.A.K., L.S.L., S.D.S., R.Y.K., R.B.), Brigham and Women’s Hospital, Boston Mass.