1. Adult Congenital and Paediatric Heart Unit, Freeman Hospital, Newcastle upon Tyne Hospitals Nhs Foundation Trust, Newcastle upon Tyne, UK
2. Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, UK
3. Adult Congenital Heart Centre and Centre for Pulmonary Hypertension, Royal Brompton Hospital, London, UK
4. National Heart and Lung Institute, Imperial College London, UK
5. Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
6. Department of Congenital Heart Disease, Bristol Heart Institute, University Hospitals Bristol and Weston NHS Foundation Trust, UK
7. Department of Cardiology, Queen Elizabeth Hospital Birmingham, Birmingham, UK
8. National Paediatric Pulmonary Hypertension Service Uk, Great Ormond Street Hospital for Children Nhs Foundation Trust, London, UK
9. Institute of Cardiovascular Science, University College London, UK