1. From the Department of Radiology (A.M., J.J.B., S.G., J.M.H., S.Z.L., D.K., B.D.A., M.M., M.P.) and Department of Medicine, Division of Cardiology (R.S.P.), Northwestern University Feinberg School of Medicine, 737 N Michigan Ave, Suite 1600, Chicago, IL 60611; and Department of Radiology, University Hospital Basel and University of Basel, Basel, Switzerland (M.P.).