| Affiliation: | 1. Pediatrics 1, Olgahospital, Klinikum Stuttgart, Stuttgart, Germany;2. Pediatrics 5, Olgahospital, Klinikum Stuttgart, Stuttgart, Germany;3. Department of Pediatrics, St. Anna Children's Hospital, Medical University Vienna, Vienna, Austria;4. German Childhood Cancer Registry, Institute for Medical Biostatistics, Epidemiology and Informatics, University Medical Center of the Johannes Gutenberg-University Mainz, Mainz, Germany;5. University Children's Hospital Basel, Basel, Switzerland;6. Cooperative Ewing Sarcoma Study Group, Essen University Hospital, Essen, Germany;7. Division of Pediatric Hematology and Oncology, Hospital for Children and Adolescents, Johann Wolfgang Goethe University, Frankfurt, Germany;8. Institute of Biostatistics and Clinical Research, University of Münster, Münster, Germany |
