- 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 12 January 2010
- Revised 7 April 2010
- Revised 12 April 2010
- Published online 15 March 2011.
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