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The 6-min walking test (6MWT) is widely used to assess exercise tolerance in patients with chronic obstructive pulmonary disease (COPD). Given the prognostic significance of the 6MWT, it is important to identify why some COPD patients perform poorly in terms of this outcome. We aimed to identify clinical determinants of a poor 6-min walking distance (<350 m) in patients with COPD.1795 individuals...
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