Affiliation: | 1. Clinic of Pediatric Hematology and Oncology, University Medical Center Hamburg‐Eppendorf, , Hamburg, Germany;2. Department of Pediatric Hematology/Oncology, Medical School, , Hannover, Germany;3. Department of Pediatric Hematology/Oncology, Hospital de Pediatría Prof. Dr. Juan P. Garrahan, , Buenos Aires, Argentina;4. Research Institute Children's Cancer Center, Hamburg, , Germany |