1. Queen Victoria Hospital NHS Foundation Trust, East Grinstead, UK
2. Oxford University Hospitals NHS Foundation Trust, Oxford, UK
3. Barts and the London School of Medicine and Dentistry, Queen Mary University of London, UK
4. Broomfield Hospital, Chelmsford, UK
5. Royal Berkshire Hospital NHS Foundation Trust, Reading, UK
6. Brigham and Women’s Hospital, Boston, MA, USA
7. National Heart and Lung Institute, London, UK
8. Imperial College London and Imperial College Healthcare NHS Trust, London, UK