1. Transfusion Medicine NHS Blood and Transplant Birmingham UK
2. University Hospitals Birmingham Birmingham UK
3. Bristol Haematology and Oncology Centre Bristol UK
4. School of Cellular and Molecular Medicine University of Bristol Bristol UK
5. Transfusion Medicine NHS Blood and Transplant Oxford UK
6. Department of Haematology Oxford University Hospitals NHS Foundation Trust Oxford UK
7. Radcliffe Department of Medicine University of Oxford, and NIHR Oxford Biomedical Research Centre Oxford UK