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Forest plot and funnel plot of prolonged P‐wave duration and atrial fibrillation recurrence. Pooled analysis of odds ratio showing that prolonged P‐wave duration is associated with AF recurrence (a). Upon sensitivity analysis by removing Okumura et al. study showed a low heterogeneity (b). Upon addition of a study that used slightly different criteria (Wu et al), the heterogeneity was high. (c). AF: atrial fibrillation; PWD: P‐wave duration
