1. Department of Surgery, General Hospital “G. Hatzikosta,” Ioannina, Greece
2. Department of Surgery, General Hospital of Filiates, Thesprotia, Greece
3. Department of Surgery, University Hospital of Ioannina, Ioannina, Greece
4. Department of Urology, General Hospital of Preveza, Preveza, Greece
5. Department of Gynecology, University Hospital of Ioannina, Ioannina, Greece
6. Department of Anatomy-Histology-Embryology, Medical School, University of Ioannina, Ioannina, Greece