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We apologize for an omission in the Acknowledgements section of this article, which should have read as follows:
Acknowledgments This work was supported by a grant from the Max-Planck Innovation Funds and a grant from the German Federal Ministry of Education and Research, NGFNplus, grant no. PNR-01GS08161-2 (to HHR).
The online version of the original article can be found under doi:10.1007/s11568-010-9137-y.