- Correspondence to: Dr M Filippi, Neuroimaging Research Unit, Department of Neuroscience, Scientific Institute and University Ospedale San Raffaele, Via Olgettina 60, 20132 Milan, Italy;
- Received August 10, 2001
- Accepted November 21, 2001
- Revised November 7, 2001
- First published June 1, 2002.
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