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Hoyle DV, Dalton JP, Chase-Topping M, Taylor DW.Hoyle DV, et al. Among authors: dalton jp.Vet Parasitol. 2003 Jan 20;111(1):65-82. doi: 10.1016/s0304-4017(02)00326-6.Vet Parasitol. 2003.PMID: 12523980Clinical Trial.