1. From the Department of Diagnostic Radiology, The University of Texas M.D. Anderson Cancer Center, 1400 Pressler St, Unit 1475, Houston, TX 77030 (B.A., W.A.M., T.M.H., R.K., K.W.M., J.E.M., B.M.M., C.M.C.); and Department of Biostatistics, Taussig Cancer Institute, Cleveland, Ohio (W.W.).