- Correspondence to Dr Alison Salt, The Wolfson Neurodisability Service, Level 10, Old Nurses Home Building, Great Ormond Street Hospital for Children, Great Ormond Street, London WC1N 3JH, UK;
- Received January 6, 2014
- Revised March 24, 2014
- Accepted April 2, 2014
- First published May 8, 2014.
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