- Dr JT Murchison, Department of Clinical Imaging, Royal Infirmary of Edinburgh, Lauriston Place, Edinburgh. EH3 9YW, UK.
- Received March 5, 1998
- Revision requested May 13, 1998
- Revised July 3, 1998
- Accepted August 20, 1998
- First published December 1, 1998.
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