1. From the David Geffen School of Medicine, University of California, Los Angeles, Calif (A.J.G., K.R., H.J.K., M.D., A.G., M.P., V.S., H.C., S.R., J.G.); Department of Radiological Sciences, UCLA, Los Angeles, Calif (K.R., H.J.K., M.D., A.G., M.P., V.S., S.R., J.G.); and UCLA Center for Computer Vision and Imaging Biomarkers, 924 Westwood Blvd, Ste 615, Los Angeles, CA 90024 (A.J.G., H.J.K., H.C., B.V., J.G.).