1. University of Massachusetts Medical School, Worcester, MA.
2. Institute for Technology Assessment, Massachusetts General Hospital, 101 Merrimac St, 10th Fl, Boston, MA 02114.
3. Department of Internal Medicine, Yale University School of Medicine, New Haven, CT.
4. Department of Emergency Medicine, Massachusetts General Hospital, Boston, MA.
5. Department of Emergency Medicine, Brown University, Providence, RI.
6. Department of Radiology, Johns Hopkins University, Baltimore, MD.
7. Department of Radiology, University of Washington, Seattle, WA.
8. Department of Radiology, Duke University Medical Center, Durham, NC.
9. Department of Radiology, Massachusetts General Hospital, Boston, MA.
10. Department of Medicine and Division of Hematology/Oncology, University of California, San Francisco, CA.
11. Department of Medicine, Mongan Institute for Health Policy, Massachusetts General Hospital, Boston, MA.