- Correspondence to Dr Leonard H van den Berg, Department of Neurology, Rudolf Magnus Institute of Neuroscience, University Medical Centre Utrecht, 3508 GA Utrecht, The Netherlands;
- Received 13 October 2016
- Revised 28 December 2016
- Accepted 8 January 2017
- Published in print 10 March 2017.
- Published online 14 March 2017.
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