Department of Haematology, Imperial College Healthcare NHS Trust, London, United Kingdom. Department of Immunology and Inflammation, Imperial College London, London, United Kingdom. Department of Haematology, Royal Brompton & Harefield NHS Foundation Trust, London, United Kingdom. Department of Emergency Medicine, Imperial College Healthcare NHS Trust, London, United Kingdom. Department of Radiology, Imperial College Healthcare NHS Trust, London, United Kingdom. Department of Intensive Care and Anaesthesia, Imperial College Healthcare NHS Trust, London, United Kingdom. Department of Intensive Care and Anaesthesia, Royal Brompton & Harefield NHS Foundation Trust, London, United Kingdom.