1. Childhood Leukemia Investigation Prague, Department of Pediatric Hematology and Oncology, Second Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic;
2. Department of Cell Biology, Faculty of Science, Charles University, Prague, Czech Republic;
3. Department of Pediatric Hematology and Oncology, Second Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic;
4. Department of Pediatrics and Adolescent Medicine, First Faculty of Medicine, Charles University and General University Hospital, Prague, Czech Republic;
5. Institute of Rheumatology, Prague, Czech Republic; and
6. Department of Clinical Hematology, University Hospital Motol, Prague, Czech Republic