1. Department of Pediatrics; University Hospital of Aarhus at Skejby; Aarhus Denmark
2. Department of Pediatrics; Clinic of Coagulation Disorders; Karolinska Hospital; Stockholm Sweden
3. Centre Regional d'Haemophilie; Centre Hospitale Universitaire; Toulouse France
4. Department of Pediatric Hematology; Emma Children's Hospital; Academic Medical Center; Amsterdam The Netherlands
5. Haemophilia Comprehensive Care Centre; Great Ormond Street Hospital for Children NHS Foundation Trust; London UK