The retrospective nature of this study limits the interpretation, because allocation to the two groups was not random so there is likely to be significant selection bias.
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Oral versus intravenous antibiotics for patients with Klebsiella pneumoniae liver abscess: study protocol for a randomized controlled trial.
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The sentences
Within the cefazolin arm there were higher rates of severe outcomes in the nine patients not receiving concomitant gentamicin, but this failed to reach significance.