We found no differences between the laterality indexes of patients and controls for the ILF (U = 18; p = 0.289; BF10 = 0.607), IFOF (U = 25, p = 0.814; BF10 = 0.473), or UF (U = 20; p = 0.409; BF10 = 0.574), which further proves that our results were specific to the AF. Here, FOXK2 is linked to atrial fibrillation.