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ROC curve analysis in circulating biomarkers to distinguish IPF from control subjects. Abbreviations: ROC—receiver operating characteristic, KL-6—Krebs von den Lungen-6, SP-D—surfactant protein D, MMP-7—matrix metalloproteinase 7, CA19-9—cancer antigen 19-9, CA-125—cancer antigen 125, CCL18—chemokine (C-C motif) ligand 18.
