KCNQ1 and familial long QT syndrome: Additionally, a population of genetically heterogeneous non-p.(Ala341Val) KCNQ1-related LQTS patients described in the paper on the South-African founder mutation was included as comparison [8], as well as a population of genetically heterogeneous non-p.(Ile375Argfs*43) KCNQ1-related LQTS patients identified in our own center (Table 1).