Correction: Ixekizumab is efficacious when used alone or when added to conventional synthetic disease-modifying antirheumatic drugs (cDMARDs) in patients with active psoriatic arthritis and previous inadequate response or intolerance to tumour necrosis factor inhibitors

Nash P, Behrens F, Orbai A, et al. Ixekizumab is efficacious when used alone or when added to conventional synthetic disease-modifying antirheumatic drugs (cDMARDs) in patients with active psoriatic arthritis and previous inadequate response or intolerance to tumour necrosis factor inhibitors. RMD Open 2018;4:e000692. doi: 10.1136/rmdopen-2018-000692

This article has been corrected since it first published. There were some copyediting errors which have been rectified now.