1. From the Division of Cardiology, British Columbia Children’s Hospital, Department of Pediatrics, The University of British Columbia, Vancouver, Canada (S.M., Z.L., P.H.D., J.E.P., J.N.C.T., E.D.S., S.S.); Department of Pediatrics, University of Utah, Primary Children’s Hospital, Salt Lake City (S.P.E.); Sudden Arrhythmia Death Syndromes Foundation of the USA, Salt Lake City, UT (A.L.); The Canadian Sudden Arrhythmia Death Syndromes Foundation, Mississauga, Ontario (P.H.); and Department of Medicine,...