1. Department of Coagulation Royal Hallamshire Hospital Sheffield UK
2. Haemostasis Section National Institute for Biological Standards and Control Potters Bar UK
3. UK National External Quality Assurance Scheme for Blood Coagulation Sheffield UK
4. Department of Haematology Newcastle Upon Tyne Hospitals Newcastle upon Tyne UK
5. The Royal London Hospital Haemophilia Centre Barts Health NHS Trust London UK
6. Katharine Dormandy Haemophilia Centre Royal Free Hospital London UK
7. Haemophilia Unit University Hospitals Birmingham Birmingham UK
8. Haematology Department University Hospital of Wales Cardiff UK