1. From the Adult Congenital Heart Centre and Centre for Pulmonary Hypertension (K.D., G.-P.D., E.K., A.P.-D., S.A.P., S.V.B.-N., M.A.G.), Royal Brompton Hospital & National Heart and Lung Institute, Imperial College School of Medicine, London, United Kingdom; Department of Clinical Cardiology, National Heart and Lung Institute (T.V.S., M.F.P., P.A.P.-W.) and Department of Epidemiology and Public Health (N.B.), Imperial College, London, United Kingdom; and International Centre of Circulatory Health...