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Figure 1 Absolute changes of von Willebrand factor levels over 48 h in patients receiving either enoxaparin, unfractionated heparin, PEG-hirudin, or dalteparin. Differences among treatment groups were analyzed by ANOVA and post hoc t tests with Bonferroni correction for multiple comparisons: after correction, comparisons were significant if p value was less than 0.0083.  von Willebrand factor was significantly lowered with PEG-hirudin and enoxaparin compared to unfractionated heparin.
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