1. Department of Haematology, Royal Brompton and Harefield NHS Foundation Trust, London, United Kingdom
2. Department of Haematology, Imperial College Healthcare NHS Trust and Imperial College London, London, United Kingdom
3. Adult Intensive Care Unit, Royal Brompton and Harefield NHS Foundation Trust, London, United Kingdom
4. Department of Anaesthesia, Royal Brompton and Harefield NHS Foundation Trust, London, United Kingdom
5. Department of Medical Statistics, Royal Brompton and Harefield NHS Foundation Trust, London, United Kingdom
6. Section of Anaesthesia, Pain Medicine and Intensive Care, Department of Surgery and Cancer, Faculty of Medicine, Imperial College London, London, United Kingdom
7. Department of Cardiothoracic Surgery, National Heart and Lung Institute, Royal Brompton and Harefield NHS Foundation Trust, London, United Kingdom