1. Dutch Childhood Oncology Group, Utrecht, the Netherlands
2. Princess Maxima Center for Pediatric Oncology, Utrecht, the Netherlands
3. University of Milano-Bicocca, Monza, Italy
4. United Kingdom Children Cancer Study Group, London, United Kingdom
5. GATLA, Buenos Aires, Argentina
6. French Acute Lymphoblastic Leukemia Study Group, Paris, France
7. Istituto di Ricovero e Cura a Carattere Scientifico Bambino Gesù Children’s Hospital, Rome, Italy
8. University of Pavia, Pavia, Italy
9. Chilean National Pediatric Oncology Group, Santiago, Chile
10. German Cooperative Study Group for Childhood Acute Lymphoblastic Leukemia, Hamburg, Germany
11. European Organisation for Research and Treatment of Cancer Children Leukemia Group, Brussels, Belgium
12. Seattle Children’s Hospital and Research Institute, Seattle, WA
13. Australian and New Zealand Children’s Haematology/Oncology Group, Perth, Australia
14. University of Western Australia, Perth, Western Australia, Australia
15. Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
16. The Chinese University of Hong Kong, Shatin, Hong Kong, Special Administrative Region, People’s Republic of China
17. St Anna Children’s Hospital, Medical University of Vienna, Vienna, Austria
18. Children Cancer Research Institute, Vienna, Austria
19. St Jude Children’s Research Hospital, Memphis, TN
20. Dana-Farber Cancer Institute, Boston, MA
21. Czech Working Group for Pediatric Hematology, Prague, Czech Republic
22. Polish Pediatric Leukemia/Lymphoma Study Group, Zabrze, Medical University of Silesia, Katowice, Poland
23. Berlin-Frankfurt-Münster Group Germany, Kiel, Germany