BTNL2 and atrial fibrillation: Six of the reported risk alleles had significantly different AF when comparing SSNS vs. SRNS: HLA-DQA1 [rs1129740], BTNL2 [rs9348883], HLA-DR/DQ [rs4642516 & rs3134996], Intergenic [rs9273371], CALHM6 [rs2637678] (p < 3.1 × 10−3).