1. From the Department of Cardiology, Westmead Hospital, Sydney, Australia (J.P., W.W.B.C., G.S., M.A.B., P.N.A.F., C.M., J.L., E.K., S.P.T., A.T., P.K.); University of Sydney, Sydney, Australia (W.W.B.C., A.K., G.S., P.N.A.F., E.K., S.P.T., A.T., P.K.); and Westmead Millennium Institute, Westmead, Australia (P.N.A.F., E.K.).