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Dargatz DA, Fedorka-Cray PJ, Ladely SR, Ferris KE, Green AL, Headrick ML.Dargatz DA, et al.J Am Vet Med Assoc. 2002 Jul 15;221(2):268-72. doi: 10.2460/javma.2002.221.268.J Am Vet Med Assoc. 2002.PMID: 12118593Free article.