1. Department of Urology; University Hospital; Ostrava Czech Republic
2. Department of Obstetrics and Gynecology; University Hospital; Ostrava Czech Republic
3. Department of Physiology; Slovak Medical University; Bratislava Slovak Republic
4. Biostatistics Unit; University of Vermont; Burlington Vermont USA
5. Department of Surgery; University of Vermont; Burlington Vermont USA
6. Department of Surgical Studies; Ostrava University; Ostrava Czech Republic