1. Department of Respiratory Medicine, Royal Brompton and Harefield NHS Foundation Trust, London, UK
2. Department of Cardiovascular Medicine, University of Oxford, Oxford, UK
3. Barts Heart Centre, St. Bartholomew’s Hospital, London, UK
4. Department of Cardiology, Royal Berkshire NHS Foundation Trust, Reading, UK
5. The Rayne Institute, St. Thomas’ Hospital, King’s College, London, UK