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Keene ON, Vestbo J, Anderson JA, Calverley PM, Celli B, Ferguson GT, Jenkins C, Jones PW.Keene ON, et al. Among authors: ferguson gt.Eur Respir J. 2009 Nov;34(5):1018-23. doi: 10.1183/09031936.00122608.Eur Respir J. 2009.PMID: 19880616Free article.Clinical Trial.