**Author details**

Katarzyna Derwich1 \*, Dorothy Mitkowski2 and Jolanta Skalska-Sadowska1

\*Address all correspondence to: kderwich@poczta.onet.pl

1 Department of Pediatric Oncology, Hematology and Transplantology, Poznan University of Medical Sciences, Poznan, Poland

2 Poznan University of Medical Sciences, Poznan, Poland
