KCNK5 and Balkan nephropathy: It is of interest that a number of patients predisposed to BEN have been shown to carry a mutation of the physiological important renal (Sepúlveda et al., 2015) two‐pore‐domain potassium (K2P) channel, TASK‐2 (K2P5.1) (Toncheva et al., 2014).