1 Department of Haematology, Imperial College Healthcare NHS Trust Imperial College London, London, United Kingdom.
2 Centre for Haematology, Imperial College London, London, United Kingdom.
3 Department of Haematology, Royal Brompton & Harefield Hospitals, part of Guy's and St Thomas's NHS Foundation Trust, London, United Kingdom.
4 Department of Adult Intensive Care, Royal Brompton & Harefield Hospitals, part of Guy's and St Thomas's NHS Foundation Trust, London, United Kingdom.
5 Division of Anesthetics, Pain Medicine, and Intensive Care, Department of Surgery and Cancer, Imperial College London, London, United Kingdom.
6 Department of Anesthesia, Royal Brompton & Harefield Hospitals, part of Guy's and St Thomas's NHS Foundation Trust, London, United Kingdom.