- Dr N Robertson, University of Cambridge, Neurology Unit, Addenbrooke’s Hospital, Hills Road, Cambridge CB2 2QQ, UK. Telephone 0044 1223 216751; fax 0044 1223 336941.
- Received February 5, 1998
- Revised May 7, 1998
- Accepted May 15, 1998
- First published November 1, 1998.
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