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We read with interest the letter titled ‘Performance of the 2017 European League Against Rheumatism/American College of Rheumatology classification criteria for adult and juvenile idiopathic inflammatory myopathies in clinical practice’ by Hočevar et al published in the Annals of the Rheumatic Diseases.1 In the letter the authors report the sensitivity and specificity of the recently published ‘2017 European League Against Rheumatism/American College of Rheumatology classification criteria for adult and juvenile idiopathic inflammatory myopathies and their major subgroups’2 observed in a retrospective cohort of 95 patients with idiopathic inflammatory myopathies (IIM) collected between 2010 and 2017 in a Slovenian rheumatology centre. As comparators, they used 72 subjects who had had a work-up for …
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