Journal of Rheumatic Diseases

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Fig. 2. Serum MMP-7, SP-D, and KL-6 levels according to semiquantitative CT grades. MMP-7: matrix metallopeptidase 7, SP-D: surfactant protein D, KL-6: Krebs von den Lungen 6, CT: computed tomography.
J Rheum Dis 2021;28:234~241 https://doi.org/10.4078/jrd.2021.28.4.234
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