1. Psychosocial Department; Emma Children's Hospital; AMC; Amsterdam the Netherlands
2. Department of Pediatric-Hematology; Emma Children's Hospital and Hemophilia Comprehensive Care Treatment Center; AMC; Amsterdam the Netherlands
3. Health Services Research Unit; Nuffield Department of Population Health; University of Oxford; Oxford England
4. Department of Vascular Medicine; Hemophilia Comprehensive Care Treatment Center; AMC; Amsterdam the Netherlands