1. Centre for Outcomes and Experience Research in Childhood Health, Illness and Disability (ORCHID) Great Ormond Street Hospital for Children NHS Trust London UK
2. Haemophilia Centre Great Ormond Street Hospital for Children NHS Trust London UK
3. Department of Paediatrics, Haematology Oncology Warsaw Medical University Warsaw Poland
4. Department of Medicine/Haematology and Coagulation Disorders Coagulation Centre Sahlgrenska University Hospital Gothenburg Sweden
5. Ege Haemophilia Centre Izmir Turkey
6. Haemophilia Centre Rhein Main (HZRM) Mörfelden‐Walldorf Germany
7. Van Creveldkliniek Division of Internal Medicine and Dermatology University Medical Center Utrecht Utrecht The Netherlands
8. Haemophilia Centre of La Sapienza University Rome Italy
9. Haemnet London UK
10. Department of Medical Psychology University Medical Centre Hamburg‐Eppendorf Hamburg Germany