- Dr SA Hawkins, Northern Ireland Neurology Service, Quin House, Royal Victoria Hospital, Grosvenor Road, Belfast BT12 6BA, Northern Ireland, UK. Telephone 0044 1232 240503 ext 4325; fax 0044 1232 235258.
- Received August 15, 1997
- Revised October 10, 1997
- Accepted October 16, 1997
- First published April 1, 1998.
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