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Arbaningsih, S. R.; Syarani, F.; Ganie, R. A.; Lelo, A. The The Levels of Vitamin D, Metalloproteinase-9 and Tissue Inhibitor Metalloproteinase-1 in COPD Patients, Healthy Smokers and Non-Smokers of Indonesian Citizens. Open Access Maced J Med Sci 2019, 7, 2123-2126.