1. Department of Radiology, University of Washington School of Medicine, Seattle Cancer Care Alliance, 825 Eastlake Ave E, LG-200, Seattle, WA 98040.
2. Department of Radiology, University of Vermont Larner College of Medicine, University of Vermont Cancer Center, Burlington, VT.
3. Department of Surgery, University of Vermont Larner College of Medicine, Burlington, VT.
4. Kaiser Permanente Washington Health Research Institute, Seattle, WA.
5. Department of Radiology, University of Cincinnati Medical Center, Cincinnati, OH.
6. Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA.
7. Department of Diagnostic Imaging, Alpert Medical School of Brown University, Providence, RI.