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Daily physical activity in ankylosing spondylitis: validity and reliability of the IPAQ and SQUASH and the relation with clinical assessments

Suzanne Arends*, Marianne Hofman, Yvo PT Kamsma, Eveline van der Veer, Pieternella M Houtman, Cees GM Kallenberg, Anneke Spoorenberg and Elisabeth Brouwer

Arthritis Research & Therapy 2013, 15:R99  doi:10.1186/ar4279