1. Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK
2. Departments of Anaesthesia, Royal London Hospital, Barts Health NHS Trust, London, UK
3. Departments of Haematology, Royal London Hospital, Barts Health NHS Trust, London, UK
4. Department of Anaesthesia, Critical Care and Pain Medicine, Royal Infirmary of Edinburgh, Edinburgh, UK