[1] Royal Free London NHS Fdn Trust, Haemophilia Ctr, London, England
[2] Royal Free London NHS Fdn Trust, Thrombosis Unit, London, England
[3] NHS Lothian, Royal Infirm, Haemophilia Thrombosis & Immunol Ctr, Edinburgh, Midlothian, Scotland
[4] Oxford Univ Hosp NHS Fdn Trust, Haemophilia & Thrombosis Ctr, Oxford, England
[5] Newcastle Upon Tyne Hosp NHS Fdn Trust, Royal Victoria Infirm, Haemophilia Comprehens Care Ctr, Newcastle Upon Tyne, Tyne & Wear, England
[6] Sheffield Teaching Hosp NHS Fdn Trust, UK NEQAS Blood Coagulat, Sheffield, S Yorkshire, England
[7] Univ Hosp Birmingham NHS Fdn Trust, Queen Elizabeth Hosp, Haemophilia Comprehens Care Ctr, Birmingham, W Midlands, England
[8] Barts Hlth NHS Trust, Royal London Hosp, Haemophilia Ctr, London, England