1. From the Departments of Radiology (M.M., N.M., K.T.B., C.L.Z., M.J., C.I.G., C.T.S., J.P.E., A.M.C., L.A.B., H.Y., A.R.D., Y.B., W.A., R.H.S., J.C.D., A.J.G., E.Z., F.E.B., S.B.S.) and Epidemiology and Biostatistics (C.S.M., M.H.), Memorial Sloan Kettering Cancer Center, 1275 York Ave, M276C, New York, NY 10065.