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Johnson W, Roof M, Vaughn E, Christopher-Hennings J, Johnson CR, Murtaugh MP.Johnson W, et al. Among authors: roof m.Vet Immunol Immunopathol. 2004 Dec 8;102(3):233-47. doi: 10.1016/j.vetimm.2004.09.010.Vet Immunol Immunopathol. 2004.PMID: 15507308Clinical Trial.