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In the original article “Acknowledgments” was missing. The Acknowledgment is given below:
This project was supported by the Swiss National Science Foundation (SNF # 310030-127586/1) and the Department for Orthopedic Research, Insel University Hospital, Bern, Switzerland.
The online version of the original article can be found under doi:10.1007/s00586-011-1827-1.
