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Wentz PA, Belknap EB, Brock KV, Collins JK, Pugh DG.Wentz PA, et al. Among authors: brock kv.J Am Vet Med Assoc. 2003 Jul 15;223(2):223-8. doi: 10.2460/javma.2003.223.223.J Am Vet Med Assoc. 2003.PMID: 12875452Free article.