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Liseth Siemons*, Peter M ten Klooster, Erik Taal, Cees AW Glas and Mart AFJ Van de Laar
* Corresponding author: Liseth Siemons L.siemons@utwente.nl
BMC Musculoskeletal Disorders 2012, 13:216 doi:10.1186/1471-2474-13-216