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Figure 7 Overall survival after the SAVER operation. Circles represent a death and are positioned on the horizontal axis at the time of the death and on the vertical axis according to the Kaplan-Meier estimator. The vertical bars are asymmetric confidence limits equivalent to one standard error. The solid line enclosed by dashed line confidence limits is the parametric survival estimate. The numbers at the foot of the graph represent the number of patients still traced at three-month intervals.
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