Phenotypic variability and unusual clinical severity of congenital long-QT syndrome in a founder population.

Brink, Pa; Crotti, Lia; Corfield, V; Goosen, A; Durrheim, G; Hedley, P; Heradien, M; Geldenhuys, G; Vanoli, Emilio; Bacchini, S; Spazzolini, Carla; Lundquist, Al; Roden, Dm; George AL, Jr; Schwartz, Peter