1. Department of Radiology, University of Washington School of Medicine, Seattle, WA.
2. Clinical Biostatistics, Fred Hutchinson Cancer Research Center, Seattle, WA.
3. Department of Radiology, Harvard Medical School, Massachusetts General Hospital, Boston, MA.
4. Department of Radiology and Imaging Sciences, University of Utah, Salt Lake City, UT.
5. Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, WI.
6. Department of Radiology, Mayo Clinic Rochester, 200 First St SW, Rochester, MN 55905.