HCN4 and left ventricular noncompaction: Thirteen pathogenic or likely pathogenic variants in genes previously associated with LVNC aetiology, including variants detected in ACTN2, HCCS, HCN4, LAMA4, MYH6, MYH7, PRDM16, TAFAZZIN and TTN—as well as three rare variants of uncertain significance in ACTC1 and RBM20 genes were identified.