Effect of add-on therapy of tiotropium in COPD treated with theophylline.

Int J Chron Obstruct Pulmon Dis · 2008 · PMC2528215 · PMID 18488437

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an expected trendno p-value reported

Therefore, the establishment of combination therapy for COPD with long-acting bronchodilators is an expected trend.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.