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Swenson SL, Hill HT, Zimmerman JJ, Evans LE, Landgraf JG, Wills RW, Sanderson TP, McGinley MJ, Brevik AK, Ciszewski DK, et al.Swenson SL, et al. Among authors: landgraf jg.J Am Vet Med Assoc. 1994 Jun 15;204(12):1943-8.J Am Vet Med Assoc. 1994.PMID: 8077142