1. From the Divisions of Cardiology (Y.Y.K.), Hospital of the University of Pennsylvania and Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, PA; the Department of Cardiology (K.G., M.J.L., O.J.B.), Children's Hospital Boston, Harvard Medical School, Boston, MA; Boston Adult Congenital Heart (BACH) Program (M.J.L.), the Department of Cardiology, Children's Hospital Boston, Boston, MA; the Division of Cardiology (M.J.L.), Brigham and Women's Hospital,...