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ROC curves of relative basal LS for the detection of PM/DM, PM and DM. ROC curves using a cut-off value of 0.43 for the relative basal LS to differentiate (A) PM/DM, (B) PM, and (C) DM from AVM. IIM, idiopathic inflammatory myopathies; PM, polymyositis; DM, dermatomyositis; AUC, area under curve; ROC, receiver operating characteristic; LS, longitudinal strain.
