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Figure 4 Prevalence of residual shunts following buttoned device occlusion of patent ductus arteriosus. Note that there was gradual increase in the number of subjects without residual shunts while the number of patients with residual shunt decreased gradually. McNemar’s pairwise comparison of data was used and Bonferroni correction was applied. The rate of change is statistically significant (p < 0.05 to <0.01). NS = no residual shunt; SS = small residual shunt; TS = trivial residual shunt.
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