1. Paediatrics 5 (oncology, hematology, immunology); Olgahospital, Klinikum Stuttgart; Stuttgart Germany
2. Department of Paediatric Oncology; University of Tuebingen; Tuebingen Germany
3. Westdeutsches Protonentherapiezentrum; University of Essen; Essen Germany
4. Department for Paediatric Surgery and Paediatric Urology; University of Tuebingen; Tuebingen Germany
5. Department of Paediatric Oncology; Helios Klinikum; Berlin-Buch Berlin Germany
6. Department of Paediatric Oncology; University of Hannover; Hannover Germany
7. Department of Ear; Nose and Throat Surgery; University of Wuerzburg; Wuerzburg Germany
8. Department of Paediatric Oncology; University of Wroclaw; Wroclaw Poland
9. St. Anna Kinderspital; Vienna Austria
10. Department of Paediatric Oncology; University of Zuerich; Zuerich Switzerland
11. Department of Women's and Children's Health; University of Uppsala; Uppsala Sweden
12. Department of Paediatric Hematology and Oncology; University Children's Hospital Muenster; Münster Germany
13. Department of Paediatric Oncology; University of Frankfurt; Frankfurt (Main) Germany