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Clinical benefits have been shown to occur when using the long-acting β 2 -agonist formoterol 4.5μg for as-needed medication rather than terbutaline 500μg in patients with unstable asthma taking an inhaled corticosteroid. This study compared their effects on health-related quality of life and the relation with conventional clinical indices in the same population. 362 asthmatics were randomized...
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