1. Independent Researcher, 43100 Karditsa, Greece
2. Department of Urology, Faculty of Medicine, School of Health Sciences, University of Ioannina, 45110 Ioannina, Greece
3. Department of Urology, Faculty of Medicine, School of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
4. Independent Researcher, 55131 Thessaloniki, Greece
5. Department of Urology, Oxford University Hospital NHS Trust, Oxford OX3 7LE, UK
6. Medical Faculty, Medical University of Sofia, 1431 Sofia, Bulgaria