1. Department of Radiology and Biomedical Imaging, Yale School of Medicine, 333 Cedar St, PO Box 208042, New Haven, CT 06520.
2. Present address: Department of Radiology, Children's Hospital of Philadelphia, Philadelphia, PA.
3. Present address: Fairfax Radiological Consultants, Fairfax, VA.
4. Present address: Department of Radiology, University of Colorado Hospital, Aurora, CO.
5. Present address: Pensacola Radiology Consultants, Sacred Heart Hospital Pensacola, Pensacola, FL.
6. Present address: Radiology Associates of Hollywood, Envision Physician Services, Pembroke Pines, FL.