Participating subjects
- Institute of Biostatistics and Analyses
 at the Faculty of Medicine of the Masaryk University
 Kamenice 3
 625 00 Brno
 Czech Republic
- Institute of Health Information and Statistics of the Czech Republic
 Palackého nám. 4
 128 01 Praha 2
 Czech Republic
- Department of Paediatric Oncology at the University Hospital Brno
 Černopolní 9
 613 00 Brno
 Czech Republic
- Department of Paediatric Haematology and Oncology at the University Hospital in Motol
 V Úvalu 84
 150 06 Praha 5
 Czech Republic
