- Professor NP Quinn, Department of Clinical Neurology, Institute of Neurology, Queen Square, London WC1 3BG, UK. Telephone 0044 171 837 3611; fax 0044 171 278 5616.
- Received July 9, 1997
- Revised January 9, 1998
- Accepted January 23, 1998
- First published July 1, 1998.
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