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Bas Kluitenberg*, Steef W Bredeweg, Sjouke Zijlstra, Wiebren Zijlstra and Ida Buist
* Corresponding author: Bas Kluitenberg b.kluitenberg@umcg.nl
BMC Musculoskeletal Disorders 2012, 13:235 doi:10.1186/1471-2474-13-235
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