1. Department of Urology, General Hospital of Athens “G. Gennimatas”, Athens, Greece
2. 2nd Department of Urology, School of Medicine, National and Kapodistrian University of Athens, Hospital of Athens “Sismanoglio”, Athens, Greece
3. 1st Department of Urology, School of Medicine, National and Kapodistrian University of Athens, Hospital of Athens “Aretaieion”, Athens, Greece