- Professor J D Mitchell, Department of Neurology, Royal Preston Hospital, Sharoe Green Lane, Fulwood, Preston, PR2 9HT, UK. Telephone 0044 1772 710423, fax 0044 1772 718746.
- Received September 10, 1997
- Revised July 3, 1998
- Accepted July 24, 1998
- First published December 1, 1998.
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