1. From the Departments of Radiology (T.J.B., Z.H.) and Biostatistics and Computer Science (J.H.), University of Wisconsin–Madison, 1111 Highland Ave, Madison, WI 53705; Departments of Radiology and Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada (A.R.); and Department of Integrative Oncology, BC Cancer Research Institute, Vancouver, British Columbia, Canada (A.R).