1. Department of Pediatrics, Division of Oncology and Hematology, Charité - Universitätsmedizin Berlin, Berlin, Germany.
2. Berlin Institute of Health (BIH), Berlin, Germany.
3. Boyne Research Institute, Drogheda, Ireland.
4. Department of Pediatrics III, West German Cancer Centre, University Hospital Essen, Essen, Germany.
5. German Cancer Research Centre (DKTK), Heidelberg, Germany.
6. Department of Paediatrics and Adolescent Medicine, University Medical Center Ulm, Ulm, Germany.
7. University Hospital Brno and International Clinical Research Center (FNUSA-ICRC), Masaryk University, Brno, Czech Republic.
8. Department of Pediatric Haematology and Oncology, Motol University Hospital, Prague, Czech Republic.
9. Department of Paediatric Oncology, Haematology and Immunology, Medical Faculty, Heinrich-Heine-University of Düsseldorf, Düsseldorf, Germany.
10. Department of Paediatric Oncology and Hematology, University Hospital for Children and Adolescents, University of Lübeck, Lubeck, Germany.
11. Department of Pediatric Oncology and Hematology, Medical University of Bialystok, Bialystok, Poland.
12. Department of Pediatrics, Hematology and Oncology, Medical University of Gdansk, Gdansk, Poland.
13. Klinik für Kinder- und Jugendmedizin, Helios Klinikum Berlin-Buch, Berlin, Germany.
14. Department of Paediatrics and Adolescent Medicine, Medical University of Graz, Graz, Austria.