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Drummond MB, Peters SP, Castro M, Holbrook JT, Irvin CG, Smith LJ, Wise RA, Sugar EA; American Lung Association Asthma Clinical Research Center Research Group.Drummond MB, et al.J Asthma. 2011 Dec;48(10):1051-7. doi: 10.3109/02770903.2011.627488. Epub 2011 Oct 27.J Asthma. 2011.PMID: 22029858Free PMC article.Clinical Trial.