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Fox LE, Rosenthal RC, Twedt DC, Dubielzig RR, MacEwen EG, Grauer GF.Fox LE, et al. Among authors: twedt dc.J Vet Intern Med. 1990 Sep-Oct;4(5):242-6. doi: 10.1111/j.1939-1676.1990.tb03116.x.J Vet Intern Med. 1990.PMID: 2124627Free article.