1. From the Department of Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, 10 Center Dr, Building 10, Room B1D417, Bethesda, MD 20892-1061 (A.C., Y.C., E.BT., M.A.A., S.L., V.S.); Great Point Health, Portland, Ore (C.T.S.); and Department of Radiology, University of Wisconsin, School of Medicine and Public Health, Madison, Wis (D.A.B.).