1. Pediatrics 5 (Oncology, Hematology, Immunology), Klinikum Stuttgart, Olgahospital, Stuttgart, Germany
2. Medical Faculty, University of Tübingen, Tübingen, Germany
3. West German Cancer Center (WTZ), University Hospital Essen, Essen, Germany
4. Hospital for Radiation Oncology, Klinikum Stuttgart, Katharinenhospital, Stuttgart, Germany
5. Department of Pediatric Hematology/Oncology and BMT, University of Wroclaw, Wroclaw, Poland
6. Pediatric Oncology, St Anna Kinderspital, Vienna, Austria
7. Department of Pediatric Oncology, University of Zürich, Zurich, Switzerland
8. Department of Women's and Children's Health, Pediatric Oncology, Uppsala University, Uppsala, Sweden
9. Department of Pediatric Hematology and Oncology, Hospital for Children and Adolescents, University of Tübingen, Tübingen, Germany
10. Department of Pediatric Oncology and Hematology, Charité-Universitätsmedizin, Berlin, Germany
11. Department of Pediatric Surgery and Urology, Hospital for Children and Adolescents, University of Tübingen, Tübingen, Germany
12. Department of Pediatric Surgery and Urology, University Hospital Giessen-Marburg, Marburg, Germany
13. Department for Children and Adolescents, University Hospital Frankfurt, Goethe University, Frankfurt, Germany