- Correspondence to Dr Benjamin Stahl, Charité Universitätsmedizin Berlin, Department of Neurology, Charitéplatz 1, 10117 Berlin, Germany;
- Received 1 March 2017
- Revised 13 November 2017
- Accepted 14 November 2017
- Published in print 11 January 2018.
- Published first 22 December 2017.
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