1. Department of Pediatric Surgery, Traumatology and Urology, Poznan University of Medical Sciences, 60-572 Poznan, Poland
2. University Research Hospital in Poznan, Poznan University of Medical Sciences, 60-355 Poznan, Poland
3. Department of Pediatric Cardiology, Nephrology and Hypertension, Poznan University of Medical Sciences, 61-701 Poznan, Poland
4. Department of Pediatric Oncology, Hematology and Transplantology, Poznan University of Medical Sciences, 60-572 Poznan, Poland