Measurement properties of the OARSI core set of performance-based measures for hip osteoarthritis: a prospective cohort study on reliability, construct validity and responsiveness... by Jaap J Tolk, Rob P A Janssen, C (Sanna) A C Prinsen, M (Marieke) C van der Steen, Sita M A Bierma Zeinstra, Max Reijman

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