1. Department of Radiology, Harvard Medical School, Boston, Massachusetts.
2. Institute for Technology Assessment, Harvard Medical School, Boston, Massachusetts.
3. Department of Pathology, Harvard Medical School, Boston, Massachusetts.
4. Department of Surgery, Harvard Medical School, Boston, Massachusetts.
5. Thyroid Unit, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts.
6. Department of Medicine, Harvard Medical School, Boston, Massachusetts.