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Baseline predictors of response and discontinuation of tumor necrosis factor-alpha blocking therapy in ankylosing spondylitis: a prospective longitudinal observational cohort study

Suzanne Arends*, Elisabeth Brouwer, Eveline van der Veer, Henk Groen, Martha K Leijsma, Pieternella M Houtman, Tim L Th A Jansen, Cees GM Kallenberg and Anneke Spoorenberg

Arthritis Research & Therapy 2011, 13:R94  doi:10.1186/ar3369