1. Center for Evidence-Based Imaging, Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, 20 Kent St, Brookline, MA 02445.
2. Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.
3. Department of Biomedical Informatics, Harvard Medical School, Boston, MA.
4. Department of Emergency Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.
5. Department of Anesthesia, Boston Children's Hospital, Harvard Medical School, Boston, MA.
6. Department of Surgery, Boston Children's Hospital, Harvard Medical School, Boston, MA.
7. Department of Emergency Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA.