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Stroke or systemic embolization outcomes of patients in 6 year follow up are shown for (A) unadjusted overall data and (B) adjusted matched data. Landmark analysis results for patients surviving beyond 2 years are shown for unmatched data in panel (C) and matched data in panel (D). Patients who had surgical ablation of atrial fibrillation had a lower risk of stroke or systemic embolic event, p=0.0005.
