- Dr DT Wade, Rivermead Rehabilitation Centre, Abingdon Road, Oxford OX1 4XD, UK. Telephone 0044 1865 240321; fax 01865–200185.
- Received October 6, 1997
- Revised January 12, 1998
- Accepted January 30, 1998
- First published August 1, 1998.
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