1. Department of Pediatric Oncology, University Children’s Hospital, Tuebingen, Germany
2. Department of Pediatric Oncology, University of Saarland, Homburg, Germany
3. Departments of Pediatric Hematology and Oncology, and Stem Cell Transplantation Program, University Children’s Hospital, University of Wuerzburg, Wuerzburg, Germany
4. Department of Pediatric Oncology, University Hospital Frankfurt, University of Frankfurt, Frankfurt, Germany
5. Pediatric Oncology and Hematology, University Hospital Heidelberg, Heidelberg, Germany
6. Department of Pediatric Hematology and Oncology, University Hospital Jena, Jena Germany