1. From the Department of Radiology and Imaging Sciences (P.K.M., B.L., P.A.H., L.F.A., J.C.C., C.C.M.) and Department of Urology (V.M.), Emory University School of Medicine, 1364 Clifton Rd NE, Atlanta, GA 30322; Department of Radiology, Northwestern University Feinberg School of Medicine, Chicago, Ill (F.H.M.); Department of Medical Imaging, University of Arizona School of Medicine, Tucson, Ariz (B.K.); and Department of Radiology, West Penn Allegheny Health System, Pittsburgh, Pa (M.H.).