- Dr GV McDonnell, Northern Ireland Regional Neurology Service, Quin House, Royal Victoria Hospital, Belfast BT12 6BA, Northern Ireland, UK. Telephone 0044 1232 240503 ext 4325; fax 0044 1232 235258.
- Received October 20, 1998
- Revised December 16, 1998
- Accepted January 20, 1999
- First published August 1, 1999.
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