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Blome S, Aebischer A, Lange E, Hofmann M, Leifer I, Loeffen W, Koenen F, Beer M.Blome S, et al. Among authors: koenen f.Vet Microbiol. 2012 Jul 6;158(1-2):42-59. doi: 10.1016/j.vetmic.2012.02.015. Epub 2012 Feb 17.Vet Microbiol. 2012.PMID: 22397931Clinical Trial.