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Arndt A, Kraft K, Wardelmann E, Steinestel K.Arndt A, et al. Among authors: kraft k.Biomed Res Int. 2015;2015:185404. doi: 10.1155/2015/185404. Epub 2015 May 27.Biomed Res Int. 2015.PMID: 26106602Free PMC article.
Maier M, Kraft K, Steinestel K, Schramm A, Lorenz KJ, Tisch M, Schwerer M, Maier H.Maier M, et al. Among authors: kraft k.HNO. 2013 Jul;61(7):593-601. doi: 10.1007/s00106-013-2676-5.HNO. 2013.PMID: 23842698German.