- Correspondence to Professor P Brown, Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, Queen Square, London WCIN 3BG, UK;
- Received 4 August 2009
- Revised 18 November 2009
- Accepted 24 December 2009
- Published in print 1 August 2010.
- Published online 3 August 2010.
- Published first 12 May 2010.
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