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Cumulative asthma exacerbations in the BTS management group and the sputum management group.
Copyright © 2010, Elsevier Limited. Reproduced with permission from Green RH, Brightling Ce, McKenna S, et al. Asthma exacerbations and sputum eosinophil counts: a randomised controlled trial. Lancet. 2002;360(9347):1715–1721.
