Comparing the construct validity of measurement instruments for pain and stiffness in patients with axial spondyloartwhritis: cross-sectional analysis in the OASIS cohort by Astrid van Tubergen, Sofia Ramiro, Robert Landewé, Annelies Boonen, Robin Christensen, Elena Nikiphorou, Dafne Capelusnik

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Does gender influence outcome measures similarly in patients with spondyloarthritis? Results from the ASAS-perSpA study by Sofia Ramiro, Maxime Dougados, Anna Molto, Clementina López-Medina, Victoria Navarro-Compán, Diego Benavent, Dafne Capelusnik

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Reference intervals of work ability and productivity loss and their use in patients with inflammatory rheumatic and musculoskeletal diseases by Casper Webers, Sofia Ramiro, Annelies Boonen, Gertjan Wolbink, Elena Nikiphorou, Dafne Capelusnik, Laura Boekel, Wouter Smeets, Roel Braekers

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Measurement properties of disease activity instruments in peripheral spondyloarthritis: a post-hoc analysis of the CRESPA trial by Casper Webers, Sofia Ramiro, Filip van den Bosch, Annelies Boonen, Anna Molto, Clementina López-Medina, Philippe Carron, Dafne Capelusnik

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