1. Department of Clinical Radiology, Medical School, University of Ioannina, University Campus, PO Box 1186, PC 45110, Ioannina, Greece.
2. Department of Pathology, Medical School, University of Ioannina, Ioannina, Greece.
3. Department of Medical Physics, Medical School, University of Ioannina, Ioannina, Greece.
4. Department of Urology, Medical School, University of Ioannina, Ioannina, Greece.