1. From the McGill Adult Unit for Congenital Heart Disease, McGill University Health Centre, Montreal, Canada (D.M., R.I.-I., J.T., A.M.); Department of Epidemiology & Biostatistics, McGill University, Montreal, Canada (L.P., M.A.); Division of General Internal Medicine, Department of Medicine, McGill University, Montreal, Canada (L.P.); Division of Clinical Epidemiology, Research Institute McGill University Health Center, Montreal, Canada (L.P., M.A.); Department of Cardiology, Montreal Heart...