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Chlodwig Kirchhoff*, Volker Braunstein, Stefan Milz, Christoph M Sprecher, Sonja Kirchhoff, Mathias Graw, Andreas B Imhoff and Stefan Hinterwimmer
* Corresponding author: Chlodwig Kirchhoff Chlodwig.kirchhoff@mri.tum.de
BMC Musculoskeletal Disorders 2012, 13:221 doi:10.1186/1471-2474-13-221