1. From the Department of Radiology, University of Chicago, 5481 S Maryland Ave, MC2026, Chicago, IL 60637 (K.D., M.L.G.); Department of Radiology and Biomedical Imaging (B.N.J., H.G., B.F., S.M., J.A., L.K., J.S.) and Department of Medicine and Epidemiology (K.K.), University of California, San Francisco, San Francisco, Calif; and Department of Diagnostic Radiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Fla (J.S.D., B.N.).