1. From the Department of Radiology, University of Alabama at Birmingham, 619 S 19th St, Suite JTN361, Birmingham, AL 35233 (M.U.A., M.Z., K.S., M.L.R.); Department of Radiology, Thomas Jefferson University, Philadelphia, Pa (J.R.E.); and Department of Radiology, King’s College London, King’s College Hospital, London, UK (A.D., P.S.).