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Wittmann M, Spohn S, Schultz K, Pfeifer M, Petro W.Wittmann M, et al. Among authors: schultz k.Pneumologie. 2007 Oct;61(10):636-42. doi: 10.1055/s-2007-980106. Epub 2007 Sep 20.Pneumologie. 2007.PMID: 17886195Clinical Trial.German.
Spielmanns M, Göhl O, Schultz K, Worth H.Spielmanns M, et al. Among authors: schultz k.Dtsch Med Wochenschr. 2015 Jun;140(13):1001-5. doi: 10.1055/s-0041-102720. Epub 2015 Jun 26.Dtsch Med Wochenschr. 2015.PMID: 26115136Review.German.
Schuler M, Faller H, Wittmann M, Schultz K.Schuler M, et al. Among authors: schultz k.J Asthma. 2016;53(4):438-45. doi: 10.3109/02770903.2015.1101134. Epub 2016 Jan 21.J Asthma. 2016.PMID: 26539757
Alma H, de Jong C, Jelusic D, Wittmann M, Schuler M, Flokstra-de Blok B, Kocks J, Schultz K, van der Molen T.Alma H, et al. Among authors: schultz k.NPJ Prim Care Respir Med. 2016 Sep 1;26:16041. doi: 10.1038/npjpcrm.2016.41.NPJ Prim Care Respir Med. 2016.PMID: 27597571Free PMC article.