1. Pediatric Hematology and Oncology, Hannover Medical School; Hannover Germany
2. Department of Pediatric Hematology-Oncology; University of Duisburg-Essen; Essen Germany
3. Munich Leukemia Laboratory; Munich Germany
4. Department of Pediatrics, St. Anna Children's Hospital and Children's Cancer Research Institute; Medical University of Vienna; Vienna Austria
5. Munich Leukemia Laboratory 2 SRO; Prague Czech Republic
6. Center of Oncocytogenetics, Institute of Medical Biochemistry and Laboratory Diagnostics, General University Hospital and First Faculty of Medicine; Charles University; Prague Czech Republic
7. Pediatric Hematology/Oncology; University of Zurich; Zurich Switzerland
8. Institute for Pathology; University Hospital of Giessen and Marburg; Giessen Germany
9. Medical Clinic and Policlinic I, Carl Gustav Carus University Hospital; Technical University; Dresden Germany.