1. Department of Radiology, Baylor College of Medicine, Houston, TX.
2. Department of Radiology, Brigham and Women's Hospital, 75 Francis St, Boston, MA 02115.
3. Department of Radiology, Moffitt Cancer Center, Tampa, FL.
4. Institute for Technology Assessment, Massachusetts General Hospital, Boston, MA.
5. Department of Radiology, Massachusetts General Hospital, Boston, MA.