- Correspondence to Thomas Foltynie, Unit of Functional Neurosurgery, Sobell Department of Motor Neuroscience, Box 146, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK;
- Received January 12, 2010
- Revised April 7, 2010
- Revised April 12, 2010
- First published June 22, 2010.
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