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Moving instead of asking? Performance-based tests and BASFI-questionnaire measure different aspects of physical function in ankylosing spondylitis

Salima FE van Weely*, J Christiaan van Denderen, Martijn PM Steultjens, Marike van der Leeden, Michael T Nurmohamed, Joost Dekker, Ben AC Dijkmans and Irene E van der Horst-Bruinsma

Arthritis Research & Therapy 2012, 14:R52  doi:10.1186/ar3765

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