- Correspondence to Professor Michael G Hanna, MRC Centre for Neuromuscular Diseases, University College London Institute of Neurology and National Hospital for Neurology and Neurosurgery, Queen Square, London, WC1N 3BG, UK;
- Received December 1, 2013
- Revised March 11, 2014
- Accepted March 12, 2014
- First published April 4, 2014.
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