1 Medical Sciences Division, Radcliffe Department of Medicine, University of Oxford, Oxford, UK.
2 NIHR Blood and Transplant Research Unit in Data Driven Transfusion Practice, Nuffield Division of Clinical Laboratory Sciences, Radcliffe Department of Medicine, University of Oxford, Oxford, UK.
3 NHSBT and Oxford University Hospitals NHS Foundation Trust, Oxford, UK.
4 Institute of Health Informatics, University College London, London, UK.
5 Haematology Department, University College London Hospitals NHS Foundation Trust, London, UK.
6 Director of Digital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK.