- Correspondence to Professor Frauke Zipp, Rhine Main Neuroscience Network (rmn2), Johannes Gutenberg University Center Mainz, Neurology Department, Langenbeckstr. 1, Mainz 55131, Germany;
- Received 17 July 2012
- Revised 23 July 2012
- Accepted 23 July 2012
- Published online 11 September 2012.
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