1. From the Department of Cardiology (R.M.W., I.H., A.M.V., A.J.P., T.G.), Children’s Hospital Boston and Department of Pediatrics, Harvard Medical School, Boston, Mass; and the Department of Medicine (R.W.), University of Toronto, Toronto, Ontario, Canada. Dr Wald is currently at the Division of Cardiology, Peter Munk Cardiac Centre, Toronto General Hospital, and Department of Pediatrics, University of Toronto, Toronto, Ontario, Canada.