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Frees D, Gerth U, Ingmer H.Frees D, et al.Int J Med Microbiol. 2014 Mar;304(2):142-9. doi: 10.1016/j.ijmm.2013.11.009. Epub 2013 Dec 1.Int J Med Microbiol. 2014.PMID: 24457183Review.