- Correspondence to Dr Christian Weimar, Department of Neurology, University of Duisburg-Essen, Hufelandstr, 55, 45122 Essen, Germany;
- Received 20 August 2009
- Revised 10 December 2009
- Accepted 11 December 2009
- Published in print 1 August 2010.
- Published online 3 August 2010.
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