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Posted by DLangenhorst on 16 Jan 2013 at 10:31 GMT

Original text: This work was supported by the German Research Foundation (DFG) through SFB-TR 52, by a grant of the German Excellence Initiative to the Graduate School of Life Sciences, University of Würzburg and by the funding program Open Access Publishing of the DFG and the University of Würzburg.

Correction: This work was supported by the German Research Foundation (DFG) through SFB-TR 52 and the Rudolf-Virchow-Center Research Network, by a grant of the German Excellence Initiative to the Graduate School of Life Sciences, University of Würzburg and by the funding program Open Access Publishing of the DFG and the University of Würzburg.

No competing interests declared.