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Step DL, Krehbiel CR, Burciaga-Robles LO, Holland BP, Fulton RW, Confer AW, Bechtol DT, Brister DL, Hutcheson JP, Newcomb HL.Step DL, et al. Among authors: newcomb hl.J Am Vet Med Assoc. 2009 Sep 1;235(5):580-7. doi: 10.2460/javma.235.5.580.J Am Vet Med Assoc. 2009.PMID: 19719452Free article.Clinical Trial.