- Dr PK Morrish, Department of Neurology, University Hospital of Wales, Heath Park, Cardiff CF4 4XN, UK. Telephone 0044 1222 747747; fax 0044 1222 744166; email:
- Received May 19, 1997
- Revised September 19, 1997
- Accepted September 25, 1997
- First published March 1, 1998.
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