1. Department of Medical Psychology University Medical Center Hamburg‐Eppendorf Hamburg Germany
2. Department of Pediatrics, Pediatric Hematology & Oncology Klinik Bad Oexen Bad Oeynhausen Germany
3. Clinic of Pediatric Hematology and Oncology University Medical Center Hamburg‐Eppendorf Hamburg Germany
4. Swabian Children's Cancer Center, Medical Faculty University of Augsburg Augsburg Germany