- Correspondence to Dr Kailash P Bhatia, Sobell Department of Motor Neuroscience and Movement Disorders, UCL Institute of Neurology, 7 Queen Square, London WC1N 3BG, UK;
- Received May 16, 2013
- Revised September 6, 2013
- Accepted October 12, 2013
- First published November 18, 2013.
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