1. From the Department of Radiology, Imaging Institute, Cleveland Clinic, 9500 Euclid Ave, L10, Cleveland, OH 44195-5243 (B.S.K.); Division of Interventional Radiology, IEO, European Institute of Oncology IRCCS, Milan, Italy (G.M.); and Department of Radiology, University of Chicago Medical Center, Chicago, Ill (J.M.L.).