1. Component Development Laboratory NHS Blood and Transplant Cambridge UK
2. Department of Haematology University of Cambridge Cambridge UK
3. National Institute for Health Research BioResource‐Rare Diseases Cambridge University Hospitals NHS Foundation Trust Cambridge UK
4. Bristol Institute for Transfusion Sciences NHS Blood and Transplant Bristol UK
5. School of Biochemistry University of Bristol Bristol UK
6. Statistics and Clinical Studies NHS Blood and Transplant Bristol UK
7. British Heart Foundation Centre of Excellence Cambridge UK
8. Medical Research Council Biostatistics Unit Cambridge Institute of Public Health Cambridge UK
9. MRC/BHF Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care University of Cambridge Cambridge UK
10. Clinical Directorate NHS Blood and Transplant Birmingham UK
11. Clinical Directorate NHS Blood and Transplant London UK
12. Centre for Haematology Imperial College London London UK