1. Klinikum Stuttgart-Olgahospital; Stuttgart Cancer Center; Zentrum für Kinder-; Jugend-und Frauenmedizin; Pediatrics 5 (Oncology, Hematology, Immunology); Stuttgart Germany
2. Department of Pediatric Surgery; University Children's Hospital Marburg; Marburg Germany
3. Klinikum Stuttgart-Olgahospital; Stuttgart Cancer Center; Zentrum für Kinder-; Jugend-und Frauenmedizin; Olgahospital; Institute of Radiology; Stuttgart Germany
4. University of Kiel; Institute of Paidopathology; Kiel Germany
5. Klinikum Stuttgart; Institute of Radiotherapy; Stuttgart Germany
6. Department of Pediatric Hematology and Oncology; University of Muenster; Muenster Germany
7. Department of Pediatric Hematology/Oncology and BMT; University of Wroclaw; Wroclaw Poland
8. St. Anna Kinderspital; Pediatric Oncology; Wien Austria
9. Department of Pediatric Oncology; University of Zurich; Zurich Switzerland
10. University of Frankfurt; Hospital for Children and Adolescents; Frankfurt/M. Germany
11. Department of Pediatric Surgery and Urology; University Children's Hospital; Tuebingen Germany
12. Department of Pediatric Hematology and Oncology; Children's Hospital; Tuebingen Germany