1. From the Divisions of Cardiology (E.T.J., J.S., L.K.H.) and Rheumatology (E.D.S.), Department of Pediatrics, The Hospital for Sick Children, and the Fetal Medicine Unit (G.R.), Mount Sinai Hospital, University of Toronto, Toronto; and the Division of Cardiology, Department of Pediatrics, Sainte-Justine Hospital, University of Montreal, Montreal (J.C.F.), Canada. Dr Hornberger is now at the University of California, San Francisco Children’s Hospital, Department of Pediatrics, Division of Cardiology,...