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Ryan Clarke P, Frey RK, Rhyan JC, McCollum MP, Nol P, Aune K.Ryan Clarke P, et al. Among authors: mccollum mp.J Am Vet Med Assoc. 2014 Mar 1;244(5):588-91. doi: 10.2460/javma.244.5.588.J Am Vet Med Assoc. 2014.PMID: 24548234Free article.