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In the May 2003 issue of Thorax we published a paper by Brusasco and colleagues on the subject of health outcomes following treatment with tiotropium.1 This paper reported the results of two 6 month studies that were combined for the purpose of analysis in this paper. One of these studies had been previously published by Donohue et al in Chest and not referenced by Brusasco and colleagues.2Thorax wishes to bring the overlap between these two papers to the attention of readers.
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