- Correspondence to Dr Thomas H P Draak, Department of Neurology, Maastricht University Medical Centre, Maastricht 6202 AZ, The Netherlands;
- Received 10 June 2017
- Revised 21 August 2017
- Accepted 17 September 2017
- Published in print 31 October 2017.
- Published first 6 October 2017.
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