[1] Univ Med Ctr Hamburg Eppendorf, Dept Med Psychol, Hamburg, Germany
[2] Sahlgrenska Univ Sjukhus, Koagulat Ctr, Gothenburg, Sweden
[3] Haemophilia Ctr Rhein Main HZRM, Morfelden Walldorf, Morfelden, Germany
[4] Ege Haemophilia Ctr, Izmir, Turkey
[5] Warsaw Med Univ, Dept Paediat Haematol Oncol, Warsaw, Poland
[6] Haemnet, London, England
[7] Great Ormond St Hosp Sick Children, London, England