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Constant work rate exercise duration while receiving dual bronchodilator vs. placebo for 48 individual subjects with COPD. COPD, chronic obstructive pulmonary disease; CWRET, constant work rate exercise time; placebo versus GFF, dual LABA/LAMA bronchodilator; GFF, glycopyrrolate/formoterol fumarate; LABA, long-acting beta agonists; LAMA, long-acting muscarinic antagonists.
