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Janssen O, Schaumann F, Holz O, Lavae-Mokhtari B, Welker L, Winkler C, Biller H, Krug N, Hohlfeld JM.Janssen O, et al. Among authors: hohlfeld jm.BMC Pulm Med. 2013 Mar 28;13:19. doi: 10.1186/1471-2466-13-19.BMC Pulm Med. 2013.PMID: 23537365Free PMC article.Clinical Trial.