1. Department of Haematology; University College London Hospitals NHS Foundation Trust and UCL Medical School; London UK
2. British Society for Blood and Marrow Transplantation; London UK
3. Department of Haematology; Royal Free London NHS Foundation Trust and UCL Medical School; London UK
4. Department of Intensive Care Medicine; University College London Hospitals NHS Foundation Trust and UCL Medical School; London UK
5. Department of Immunology; Royal Free London NHS Foundation Trust and UCL Medical School; London UK