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The aetiology of chronic obstructive pulmonary disease (COPD) is complex. While cigarette smoking is a well‐established cause of COPD, a myriad of assessed genetic factors has given conflicting data. Since gene‐environment interactions are thought to be implicated in aetiopathogenesis of COPD, we aimed to examine the matrix metalloproteinase (MMP) 9 C–1562T (rs3918242) functional variant and cigarette...
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