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ROC curves of muscle echo intensity, thickness, and shear wave velocity in the diagnosis of PM and DM. ROC curves of echo intensity (A) of the deltoid, biceps brachii, rectus femoris, and vastus lateralis. ROC curves of thickness (B); shear wave velocity (C); and the combination of echo intensity, thickness, and shear wave velocity (D). ROC, receiver operating characteristic; PM, polymyositis; DM, dermatomyositis.
