- Correspondence to Professor Ludwig Kappos, Neurology and Department of Research, University Hospital Basel, Petersgraben 4, Basel 4031, Switzerland;
- Received 28 June 2013
- Revised 4 October 2013
- Accepted 7 October 2013
- Published in print 1 November 2014.
- Published online 17 October 2014.
- Published first 11 November 2013.
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