From the Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Tex (G.R.S.); Department of Radiology, University of Pittsburgh Medical Center Children's Hospital of Pittsburgh, Pittsburgh, Pa (J.H.S.); Department of Radiology, Emory University and Children's Healthcare of Atlanta, Atlanta, Ga (A.A.); Department of Diagnostic Imaging, The Hospital for Sick Children and Department of Medical Imaging, University of Toronto, Toronto, Canada (G.B.C.); Department of Radiology, Montefiore Medical Center, Bronx, NY (V.C.); Department of Radiology, Duke University Medical Center, Durham, NC (J.T.D.); Department of Radiology, Mallinckrodt Institute of Radiology, St. Louis Children's Hospital, Washington University School of Medicine, St Louis, Mo (G.K.); Department of Radiology, Nationwide Children's Hospital, Columbus, Ohio (R.K.); Stanford University School of Medicine, Lucile Packard Children's Hospital, Stanford, Calif (M.P.L.); Department of Radiology, Texas Children's Hospital, Houston, Tex (P.M.M.); Nemours Children's Hospital, Nemours Children's Health System, University of Central Florida College of Medicine, Orlando, Fla (D.J.P.); Liver Imaging Group, Department of Radiology, University of California San Diego, San Diego, Calif (C.B.S.); Department of Radiology, Cincinnati Children's Hospital, Cincinnati, Ohio (A.J.T.); and Department of Radiology, University of Cincinnati College of Medicine, 3333 Burnet Ave, MLC 5031, Cincinnati, OH 45229 (A.J.T.).