1. From the Department of Radiology, New York University Grossman School of Medicine, 660 First Ave, New York, NY 10016 (S.P.D.); Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wis (C.D.V., A.B.R., J.Y.T., K.S.L.); and Department of Medical Imaging, University of Toronto, Scarborough Health Network, Scarborough, ON, Canada (J.I.B.).