Australian and New Zealand Children's Hematology and Oncology Group Perth Children's Hospital all in Perth WA Australia

Czech Working Group for Pediatric Hematology all Prague Czech Republic

From the Princess Máxima Center for Pediatric Oncology both in Utrecht the Netherlands

Hôpital Universitaire des Enfants Reine Fabiola Brussels

Princess Maxima Center for Pedatric Oncology Utrecht the Netherlands

St Anna Children's Hospital Department of Pediatric Hematology and Oncology Medical University of Vienna and St Anna Children's Cancer Research Institute both in Vienna

Tettamanti Center all in Italy

the Department of Pediatric Hematology University Robert Debre Hospital Assistance Publique Hôpitaux de Paris Paris

the Department of Pediatrics and Adolescent Medicine Rigshospitalet University Hospital Copenhagen

the German Cooperative Study Group for Childhood Acute Lymphoblastic Leukemia Hamburg all in Germany