NPPB and atrial fibrillation: Excluding outliers resulted in diminishing the strength of association of high levels of BNP and NT-proBNP, and AF recurrence (BNP OR 2.14, 95% CI: 1.62–2.83), p < 0.01 and NT-proBNP OR 2.63, 95% CI: 1.77–3.91, p < 0.01, Supplementary Fig. 1).