For the analysis of atrial fibrillation, the number of SNPs used for MR analysis was 19, 13, 27, 19, 15, and 20 for VEGF-A, VEGF-C, VEGF-D, VEGF (uncategorized), VEGFR-2, and VEGFR-3, respectively. This evidence concerns the gene FLT4 and atrial fibrillation.