1. Department of Pediatric Surgery, Traumatology and Urology, Poznan University of Medical Sciences, Szpitalna Street 27/33, 60-572 Poznan, Poland
2. Department of General and Transplant Surgery, Poznan University of Medical Sciences, 60-355 Poznan, Poland
3. Department of Clinical Pathology, Poznan University of Medical Sciences, 60-355 Poznan, Poland