- Correspondence to Dr C D J Sinclair, MRC Centre for Neuromuscular Diseases, Box 65, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK;
- Received February 25, 2011
- Revised April 14, 2011
- Accepted April 21, 2011
- First published May 25, 2011.
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