- Correspondence to Dr José Berciano, Service of Neurology, University Hospital Marqués de Valdecilla (IDIVAL, UC and CIBERNED), Santander 39008, Spain;
- Received 13 February 2015
- Revised 14 April 2015
- Accepted 20 April 2015
- Published in print 1 May 2016.
- Published online 14 April 2016.
- Published first 13 May 2015.
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