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Duff GC, McMurphy CP.Duff GC, et al. Among authors: mcmurphy cp.Vet Clin North Am Food Anim Pract. 2007 Jul;23(2):281-97, vii. doi: 10.1016/j.cvfa.2007.04.003.Vet Clin North Am Food Anim Pract. 2007.PMID: 17606151Review.