[1] Churchill Hosp, Oxford Haemophilia & Thrombosis Ctr, Oxford OX3 7LJ, England
[2] Univ Hosp, Birmingham, W Midlands, England
[3] St Thomas Hosp, London, England
[4] Royal Infirm, Edinburgh, Midlothian, Scotland
[5] Royal Free Hosp, London NW3 2QG, England
[6] Univ Nottingham Hosp, Queens Med Ctr, Nottingham NG7 2UH, England
[7] Univ Hosp Skejby, Aarhus, Denmark