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Griese M, Essl R, Schmidt R, Ballmann M, Paul K, Rietschel E, Ratjen F; Beat Study Group.Griese M, et al.Respir Res. 2005 Nov 7;6(1):133. doi: 10.1186/1465-9921-6-133.Respir Res. 2005.PMID: 16274485Free PMC article.Clinical Trial.