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Adjusted confounders were baseline age, sex, disease duration, concomitant PSL and MTX, starting date and switched number of bDMARDs. ABT = abatacept, ADA = adalimumab, CZP = certolizumab pegol, ETN = etanercept, GLM = golimumab, IFX = infliximab, TCZ = tocilizumab, bDMARDs = biological disease-modifying antirheumatic drugs.
