1. University Center of Excellence in Urology, Department of Minimally Invasive and Robotic Urology, Wroclaw Medical University, 50-556 Wroclaw, Poland
2. Department of Clinical and Experimental Pathology, Wroclaw Medical University, 50-556 Wroclaw, Poland
3. Division of Histology and Embryology, Department of Human Morphology and Embryology, Wroclaw Medical University, 50-368 Wroclaw, Poland
4. Center for Statistical Analysis, Wroclaw Medical University, Marcinkowskiego 2-6, 50-368 Wroclaw, Poland