1. Department of Radiology, Royal Brompton Hospital, London, United Kingdom
2. University of Leeds Medical School, Leeds, United Kingdom
3. St George's University of London, London, United Kingdom
4. Anaesthesia and Critical Care, Royal Brompton Hospital, London, United Kingdom
5. National Pulmonary Hypertension Service, Royal Brompton Hospital, London, United Kingdom
6. Department of Haematology, Imperial College London, London, United Kingdom
7. Department of Haematology, Royal Brompton Hospital, London, United Kingdom
8. Department of Haematology, Imperial College Healthcare NHS Trust, London, United Kingdom