1. The University of Chicago Comer Children's Hospital, IL;
2. Columbus Children's Hospital and The Ohio State University, Columbus, OH;
3. Children's Oncology Group–Operations Center, Arcadia, CA;
4. Midwest Children's Cancer Center, Department of Pediatrics of the Medical College of Wisconsin, Children's Hospital of Wisconsin, Milwaukee;
5. Department of Clinical Sciences and Paediatrics, University of Umeå, Umeå, Sweden;
6. Leukaemia Research Cytogenetics Group, Cancer Sciences Divison, University of Southampton, Southampton, United Kingdom;
7. Génétique des Hémopathies, Laboratoire d'Hématologie, Hôpital Purpan, Toulouse, France;
8. University Hospital Schwanenweg, Department of Pediatrics, Kiel, Germany;
9. St Jude Children's Research Hospital and the University of Tennessee Health Science Center, Memphis;
10. Pediatrics Department, University of Padova, Padova, Italy;
11. Department of Pediatric Oncology, Dana-Farber Cancer Institute and Division of Hematology Oncology, Children's Hospital, Boston, MA;
12. Children's University Hospital, Department of Pediatric Hematology and Oncology, University of Hamburg, Hamburg, Germany