- Correspondence to Dr M Filippi, Neuroimaging Research Unit, Institute of Experimental Neurology, Scientific Institute and University Ospedale San Raffaele, via Olgettina, 60, 20132 Milan, Italy;
- Received January 19, 2009
- Revised April 15, 2009
- Accepted April 27, 2009
- First published June 21, 2009.
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