1. Faculty of Psychology and Educational Sciences, University of Leuven, Leuven, Belgium.
2. Department of Pediatric Hemato-Oncology, University Hospitals Leuven, Leuven, Belgium.
3. Department of Paediatric Haematology-Oncology and Stem Cell Transplantation, Ghent University Hospital, Ghent, Belgium.
4. Paediatric Haematology, Oncology and HIV, Antwerp University Hospital, Edegem, Belgium.
5. Medical Oncology & Haematology KZ, Brussel University Hospital, Jette, Belgium.