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van der Heijde D, Deodhar A, FitzGerald O, et al. 4-year results from the RAPID-PsA phase 3 randomised placebo-controlled trial of certolizumab pegol in psoriatic arthritis. RMD Open 2018;4:e000582. doi: 10.1136/rmdopen-2017-000582.
Several changes were inadvertently missed during the production stage. These corrections are now incorporated into the current version.