[1] Univ Sheffield, Sheffield S10 2TN, S Yorkshire, England
[2] Univ Med Ctr Utrecht, Julius Ctr Hlth Sci & Primary Care, Dept Hematol, Van Creveldklin, Utrecht, Netherlands
[3] Manchester Royal Infirm, Manchester, Lancs, England
[4] Univ Helsinki, Cent Hosp, FIN-00014 Helsinki, Finland
[5] Paris AP HP Haemophilia Treatment Ctr, Paris, France
[6] Univ Milan, I-20122 Milan, Italy