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Figure 7 Bar graphs comparing the total complication and unbuttoning and effective occlusion rates with each cohort. Note significant decrease (p < 0.00) in major complication rate with the fourth generation device, which appears to be largely related to a decrease (p < 0.001) in unbuttoning rate. Effective occlusion, defined as no or trivial residual shunt (4), has remained similar (p > 0.1).
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