1 From the Department of Radiology, Brigham and Women's Hospital/Harvard Medical School, 75 Francis St, Boston, MA 02115 (A.J.); Department of Radiology, University of Ottawa/The Ottawa Hospital, Ottawa, Ontario, Canada (A.D.M.G.F., M.L.B.V.); Department of Radiology, Yale New Haven Hospital/Yale University, New Haven, Conn (I.D.d.O.S.); and Department of Radiology, Mayo Clinic, Jacksonville, Fla (A.A.).