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A 4-year trial of tiotropium in chronic obstructive pulmonary disease.
Tashkin DP, Celli B, Senn S, Burkhart D, Kesten S, Menjoge S, Decramer M; UPLIFT Study Investigators. Tashkin DP, et al. N Engl J Med. 2008 Oct 9;359(15):1543-54. doi: 10.1056/NEJMoa0805800. Epub 2008 Oct 5. N Engl J Med. 2008. PMID: 18836213 Free article. Clinical Trial.