From the Department of Medical Imaging, The Ottawa Hospital, University of Ottawa, Ottawa, Canada (N.S., R.M.H., C.W.); Departments of Radiology (M.S.D., D.B., N.E.C.) and Urology (M.S.D.), University of Michigan Medical Center, Ann Arbor, Mich; Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, Mass (S.G.S., I.G., A.B.S.); Department of Radiology, NYU Langone Medical Center, New York, NY (B.B., A.M.D., N.H.); Department of Radiology, University of Nebraska Medical Center, Omaha, Neb (Z.B., R.T.D., E.E., E.G.); Department of Epidemiology, Ottawa Hospital Research Institute, Ottawa, Canada (T.R.); and Departments of Radiology and Urology, Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 2201 Inwood Rd, 2nd Floor, Suite 202, Dallas, TX 75390-9085 (I.P.).