1. Van Creveldkliniek; University Medical Center Utrecht; Utrecht University; The Netherlands
2. Physical Therapy Research; Department of Rehabilitation; Physical Therapy Science and Sport; Brain Center Rudolf Magnus; Utrecht University; The Netherlands
3. Department of Pediatric Hematology; Academic Medical Center; Amsterdam The Netherlands
4. Division of Rheumatology; Department of Paediatrics; The Hospital for Sick Children; Institute of Health Policy, Management and Evaluation; Dalla Lana School of Public Health; University of Toronto; Toronto ON Canada
5. Center for Physical Therapy Research and Innovation in Primary Care; Julius Health Care Centers; Utrecht The Netherlands
6. Department of Pediatrics; Division of Hematology/Oncology Hospital for Sick Children; University of Toronto; Toronto ON Canada
7. Department of Haematology; Christian Medical College; Vellore India
8. Department of Physical Medicine and Rehabilitation; Christian Medical College; Vellore India
9. Department of Child Development and Exercise; University Medical Center Utrecht and Children's Hospital; Utrecht University The Netherlands