1. From Sr Bernice Research Program in Inherited Heart Diseases (D.F., R.O.) and Mark Cowley Lidwell Program in Electrophysiology and Biophysics (J.I.V.), Victor Chang Cardiac Research Institute, Darlinghurst, Australia; Cardiology Department (D.F.), St Vincent’s Hospital, Darlinghurst, Australia; and Faculties of Medicine and Science (D.F., J.I.V.), University of New South Wales, Kensington, Australia.