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Olson EJ, Epperson WB, Zeman DH, Fayer R, Hildreth MB.Olson EJ, et al. Among authors: zeman dh.J Am Vet Med Assoc. 1998 Apr 1;212(7):987-90.J Am Vet Med Assoc. 1998.PMID: 9540869Clinical Trial.