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Stegeman JR, Birkenheuer AJ, Kruger JM, Breitschwerdt EB.Stegeman JR, et al.J Am Vet Med Assoc. 2003 Apr 1;222(7):959-63, 952. doi: 10.2460/javma.2003.222.959.J Am Vet Med Assoc. 2003.PMID: 12685786Free article.