- Correspondence to: Professor A J Lees, Reta Lila Weston Institute of Neurological Sciences, Windeyer Building, University College London, 46 Cleveland Street, London W1T 4JF, UK;
- Received April 27, 2001
- Accepted October 25, 2001
- Revised October 12, 2001
- First published March 1, 2002.
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