1. Adult Congenital Heart Centre and National Centre for Pulmonary Hypertension, Royal Brompton Hospital, London, United Kingdom (M.B., G.-P.D., M.A.G.)
2. Department of Cardiovascular Medicine, Division of Adult Congenital and Valvular Heart Disease, University Hospital Muenster, Germany (M.B., G.-P.D.)
3. Department of Cardiovascular Medicine, Division of Adult Congenital Heart Disease, University of Zagreb School of Medicine, University Hospital Centre Zagreb, Croatia (M.B.)
4. National Heart and Lung Institute, Imperial College, London, United Kingdom (M.B., G.-P.D., M.A.G.)