Tiotropium in combination with placebo, salmeterol, or fluticasone-salmeterol for treatment of chronic obstructive pulmonary disease: a randomized trial.
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Ann Intern Med. 2007 Apr 17;146(8):545-55. doi: 10.7326/0003-4819-146-8-200704170-00152. Epub 2007 Feb 19.
Ann Intern Med. 2007.
PMID: 17310045
Free article.
Clinical Trial.