1. University Hospital of Lord's Transfiguration, Poznan University of Medical Sciences, Poznan, Poland.
2. Heliodor Swiecicki University Hospital, Poznan University of Medical Sciences, Poznan, Poland.
3. Department of Pediatric Oncology, Hematology and Transplantology, and Poznan University of Medical Sciences, Poznan, Poland.
4. Department of Computer Science and Statistics, Poznan University of Medical Sciences, Poznan, Poland.