GJA1 and atrial fibrillation: We confirmed the association between the GJA1 SNP rs1015451 and total HR during AF in the replication set (TT 113,139 ± 15,761 beats/day, TC 119,014 ± 18,771 beats/day, CC 128,489 ± 23,424 beats/day, P = 1.2 × 10−3; TT vs CC: P = 1.4 × 10−3, TT vs TC: P = 0.07, TC vs CC: P = 0.05, Fig. 2).