1 Division of Genetic Medicine (A.M.M., A.S.B., H.C.M.), Department of Pediatrics, University of Washington, Seattle, WA; Department of Paediatrics and Child Health (C.K.), University of Otago, Wellington, New Zealand; Department of Medicine (A.L.S., I.E.S.), Epilepsy Research Centre, The University of Melbourne, Austin Health, Heidelberg, Australia; The Florey Institute and Murdoch Children's Research Institute (I.E.S.), Parkville, Australia; Department of Neurology (I.E.S.), Royal Children's Hospital, Parkville, Australia; and Department of Paediatrics and Child Health (L.G.S.), University of Otago, Wellington, New Zealand.