1. Wenckebach Institute; University Medical Center Groningen, University of Groningen; Groningen The Netherlands
2. Comprehensive Cancer Center North East Netherlands; Groningen The Netherlands
3. Medical Psychology, University Medical Center Groningen, University of Groningen; The Netherlands
4. Beatrix Children's Hospital, Division of Pediatric Oncology; University Medical Center Groningen, University of Groningen; Groningen The Netherlands