- Correspondence to: Dr Jens Kuhn Department of Neurology, Kliniken der Stadt Köln, Krankenhaus Merheim, Ostmerheimerstrasse 200, D-51109 Cologne, Germany;
- Received 26 May 2004
- Accepted 10 October 2004
- Revised 27 August 2004
- Published online 16 June 2005.
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