1. Royal Brompton and Harefield NHS Foundation Trust, London, UK, and University Hospital of Heraklion; Crete Greece
2. Royal Brompton and Harefield NHS Foundation Trust; London UK
3. King's College Hospital; London UK
4. Royal Brompton and Harefield NHS Foundation Trust and National Heart and Lung Institute, Imperial College; London UK
5. University Hospital of Heraklion; Crete Greece
6. Royal Free Hospital and University College London Medical School; London UK