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Unadjusted Kaplan-Meier estimate of the cumulative event-free survival (any first event) in the whole (non-SA– SA) A341V population plotted vs the LQT1 non-A341V group. Any cardiac event, whichever occurred first, was considered from birth through 40 years of age and before β-blocker therapy. Numbers at risk are indicated. (From ref. 13)
