1 Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Center for Obstetrics and Pediatrics, Hamburg, Germany.
2 Research Institute Children's Cancer Center, Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
3 Medical controlling, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
4 Department of Pediatric Hematology and Oncology, Division of Pediatric Stem Cell Transplantation and Immunology, University Medical Center Hamburg-Eppendorf, Center for Obstetrics and Pediatrics, Hamburg, Germany.