1. CLIP - Childhood Leukaemia Investigation Prague, Prague, Czech Republic
2. Department of Paediatric Haematology and Oncology, Second Faculty of Medicine, Charles University, Prague, Czech Republic
3. Department of Pediatrics and Adolescent Medicine, University Hospital Rigshospitalet, Copenhagen, Denmark
4. Department of Dermatovenereology, Second Faculty of Medicine, Charles University, Prague, Czech Republic
5. University Hospital Motol, Prague, Czech Republic
6. Institute of Clinical Medicine, Faculty of Medicine, University of Copenhagen, Copenhagen, Denmark