1. Adult Congenital Heart Centre and Centre for Pulmonary Hypertension, Royal Brompton Hospital, Royal Brompton & Harefield Hospitals, Guy’s and St Thomas’ NHS Foundation Trust, London, UK
2. National Heart and Lung Institute, Imperial College London, London, UK
3. Department of Cardiology, St Thomas’ Hospital, London, UK
4. Faculty of Life Sciences and Medicine, King’s College London, Strand, London, UK