1. Olgahospital; Pediatrics 5 (Oncology, Hematology, Immunology, Rheumatology, Gastroenterology, and General Pediatrics); Klinikum Stuttgart; Stuttgart; Germany
2. Department of Radiotherapy; University of Münster; Münster; Germany
3. Department of Pediatric Surgery and Pediatric Urology; University of Tübingen; Tübingen; Germany
4. Institute of Pediatric Pathology; University of Kiel; Kiel; Germany
5. Department of Pediatric Oncology; University of Würzburg; Würzburg; Germany
6. Department of Pediatric Oncology; University of Freiburg; Freiburg; Germany
7. Department of Pediatric Oncology; University of Heidelberg; Heidelberg; Germany
8. Department of Pediatric Oncology; University of Wroclaw; Wroclaw; Poland
9. St. Anna Kinderspital; Vienna; Vienna; Austria
10. Department of Women's and Child's Health; University of Uppsala; Uppsala; Sweden
11. Department of Pediatric Oncology University of Frankfurt (Main); Frankfurt; Germany