1. Institute of Cell and Molecular Pathology, Hannover Medical School, Hannover, Germany;
2. Center of Oncocytogenetics, Charles University, General Faculty Hospital, Prague, Czech Republic;
3. Department of Clinical Genetics, Erasmus University Medical Center, Rotterdam, The Netherlands;
4. Dutch Childhood Oncology Group, The Hague, The Netherlands;
5. Department of Oncology, University Children's Hospital, Zurich, Switzerland;
6. Department of Pediatric Hematology/Oncology, Justus Liebig University, Giessen, Germany;
7. St Anna Children's Hospital, Vienna, Austria;
8. Institute of Pathology, University Hospital, Odense, Denmark;
9. Clinica Oncoematologica Pediatrica, University of Padova, Padova, Italy;
10. Department of Pediatrics, Aarhus University Hospital Skejby, Aarhus, Denmark;
11. Department of Pediatric Hematology and Oncology, University Hospital Motol and Charles University, Prague, Czech Republic;
12. Department of Pediatric Oncology, Sophia Children's Hospital, Erasmus University, Rotterdam, The Netherlands;
13. Istituti di Ricovero e Cura a Carattere Scientifico Policlinico San Matteo, Department of Pediatrics, University of Pavia, Pavia, Italy;
14. Department of Adolescent and Pediatric Medicine, University Hospital, Freiburg, Germany; and
15. Department of Pediatric Hematology and Oncology, Ospedale Bambino Gesù, Rome, Italy