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T Hirano, T Yamagata, M Gohda, et al. Inhibition of reactive nitrogen species production in COPD airways: comparison of inhaled corticosteroid and oral theophylline (Thorax 2006;61:761–6). This article was originally published with an incorrect digital object identifier (doi). It has been updated with the correct doi: 10.1136/thx.2005.058156. We apologise for any inconvenience caused.
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