- Correspondence to Professor Ammar Al-Chalabi, Department of Clinical Neuroscience, King's College London, London SE5 8AF, UK;
- Received 25 September 2013
- Revised 10 December 2013
- Accepted 30 December 2013
- Published in print 1 January 2015.
- Published online 17 December 2014.
- Published first 24 January 2014.
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