- Correspondence to Professor Ammar Al-Chalabi, Maurice Wohl Clinical Neuroscience Institute, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, UK;
- Received December 13, 2015
- Revised March 24, 2016
- Accepted April 6, 2016
- First published July 4, 2016.
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