- Correspondence to Dr Andrew Chan, Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Gudrunstr. 56, 44791 Bochum, Germany;
- Received 25 April 2012
- Revised 6 July 2012
- Accepted 19 July 2012
- Published in print 1 December 2012.
- Published online 14 November 2012.
- Published first 11 August 2012.
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