1. Bristol Institute for Transfusion Sciences, NHS Blood and Transplant; Bristol UK
2. Department of Haematology; University College London Cancer Institute; London UK
3. German Registry on Congenital Dyserythropoietic Anaemias, Medizinishe; Universitätsklinik III; Ulm Germany
4. Statistics and Clinical Studies; NHS Blood and Transplant; Bristol UK
5. Institute of Liver Studies, King's College Hospital NHS Foundation Trust; London UK
6. Department of Haematology; Bristol Royal Infirmary, North Bristol NHS Trust; UK
7. International Blood Group Reference Laboratory; NHS Blood and Transplant; Bristol UK