1 From the Department of Radiology, University of Alabama at Birmingham School of Medicine, 619 19th Street S, JT N338, Birmingham, AL 35249 (C.A.W.); Medical Research Institute of New Zealand, Wellington, New Zealand, and Artibiotics, Wellington, New Zealand (C.K.); Department of Radiology, Stanford University School of Medicine, Stanford, Calif (V.L.T.); and Department of Radiology, Seth GS Medical College and KEM Hospital, Parel Mumbai, Maharashtra, India (T.R.G.).