1. Department of Pediatric Hematology; Academic Medical Center; Amsterdam The Netherlands
2. Department of Clinical Epidemiology; Leiden University Medical Center; Amsterdam The Netherlands
3. Van Creveldkliniek, Department of Hematology; University Medical Center; Utrecht The Netherlands
4. Department of Hematology; Christian Medical College; Vellore India
5. Department of Rehabilitation, Physical Therapy Science and Sport, Brain Center Rudolf Magnus; University Medical Center Utrecht; Utrecht the Netherlands
6. Department of Rehabilitation; Hospital for Sick Children; Toronto Ontario Canada
7. Department of Paediatrics, Division of Hematology/Oncology, Hospital for Sick Children; University of Toronto; Toronto Ontario Canada