1. From Adult Congenital Heart Disease Centre, (E.L.H., M.A.G., A.U.., B.S., H.U., W.L., V.S., P.O., D.F.S., S.V.B.-N.), Cardiac Morphology Unit (K.P.M., S.Y.H.), and Non-Invasive Cardiology Department (P.W.), Royal Brompton Hospital, London, United Kingdom; National Institute for Health Research Cardiovascular Biomedical Research Unit, Royal Brompton & Harefield NHS Foundation Trust and Imperial College London, United Kingdom (E.L.H., M.A.G., G.C.S., P.J.K., D.J.P., D.F.S., S.V.B.-N.); Division of...