- Dr Jeremy Rowe, Department of Neurosurgery, Radcliffe Infirmary, Woodstock Road, Oxford OX2 6HE, UK. Telephone 0044 1865 311188; fax 0044 1865 224898.
- Received December 11, 1996
- Revised June 11, 1997
- Accepted July 7, 1997
- First published January 1, 1998.
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