1. Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts.
2. Kaiser Permanente Washington Health Research Institute, Seattle, Washington.
3. Dartmouth Institute for Health Policy and Clinical Practice, Norris Cotton Cancer Center, Geisel School of Medicine, Lebanon, New Hampshire.
4. Fort Collins Radiologic Associates, PC, Fort Collins, Colorado.
5. Department of Radiology, University of North Carolina, Chapel Hill, Chapel Hill, North Carolina.
6. Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
7. Department of Internal Medicine, University of New Mexico, Albuquerque, New Mexico.
8. Department of Radiology, University of Washington School of Medicine, Seattle, Washington.
9. Department of Radiology, University of Washington School of Medicine; Department of Health Services, University of Washington School of Public Health; Hutchinson Institute for Cancer Outcomes Research, Seattle, Washington.