1. Department of Pediatric Surgery and Urology University of Frankfurt Frankfurt Germany
2. Klinikum Stuttgart‐Olgahospital, Stuttgart Cancer Center, Zentrum für Kinder‐, Jugend‐ und Frauenmedizin, Pediatrics 5 (Oncology, Hematology, Immunology) Stuttgart Germany
3. Department of Pediatric Hematology and Oncology Children's Hospital Tuebingen Germany
4. Department of Pathology Section of Pediatric Pathology Bonn Germany
5. Dermatopathologie Friedrichshafen/Bodensee Friedrichshafen Germany
6. Department of Pediatric Surgery University Children's Hospital Marburg Marburg Germany
7. Klinikum Stuttgart ‐ Olgahospital, Stuttgart Cancer Center, Zentrum für Kinder‐, Jugend‐ und Frauenmedizin, Olgahospital, Institute of Radiology Stuttgart Germany
8. Klinikum Stuttgart, Institute of Radiotherapy Stuttgart Germany
9. Department of Pediatric Hematology and Oncology University of Muenster Muenster Germany
10. Department of Pediatric Surgery and Urology University Children's Hospital Tuebingen Germany
11. Department of Pediatric Oncology University of Zurich Zurich Switzerland
12. Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, Faculty of Medicine University of Freiburg Freiburg Germany
13. Department of Children and Adolescents University of Frankfurt Frankfurt Germany