COPD exacerbations · 4: Prevention
In the paper entitled 'COPD exacerbations � 4 ? Prevention' by S Scott, P Walker and P M A Calverley which appeared in the May issue of Thorax (2006;61:440�7), the dose of tiotropium used in the studies by Casaburi and Brusasco referred to in table 1 on page 444 which currently reads '18 mg twice daily' should read '18 mg once daily'. The publishers apologise for this error.
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doi: 10.1136/thx.2005.041848 Thorax 1 May 2006 vol. 61 no. 5 440-447
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