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An acknowledgement of financial support was omitted:
Acknowledgement: The authors would specially like to thank the German Research Council (Deutsche Forschungsgemeinschaft, WI 1352/6-1) and the Deutsche Arthrose-Hilfe e.V. for financial support.
The online version of the original article can be found at http://dx.doi.org/10.1007/s00586-005-0954-y
