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Callahan JD, Brown F, Osorio FA, Sur JH, Kramer E, Long GW, Lubroth J, Ellis SJ, Shoulars KS, Gaffney KL, Rock DL, Nelson WM.Callahan JD, et al. Among authors: osorio fa.J Am Vet Med Assoc. 2002 Jun 1;220(11):1636-42. doi: 10.2460/javma.2002.220.1636.J Am Vet Med Assoc. 2002.PMID: 12051502Free article.