- Correspondence to L J Balk, Department of Neurology, VU University Medical Centre, De Boelelaan 1118, MS Centrum VUmc, PK 0-Z-126, Amsterdam 1081 HZ, The Netherlands;
- Received September 30, 2013
- Revised November 19, 2013
- Accepted December 2, 2013
- First published January 28, 2014.
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