1 Department of Urology, Hippokration Hospital, Thessaloniki, Greece.
2 Department of Nephrology, Hippokration Hospital, Aristotle University of Thessaloniki, Konstantinoupoleos 49, 54642, Thessaloniki, Greece.
3 First Department of Urology, G. Gennimatas Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece.
4 Department of Nephrology, Hippokration Hospital, Aristotle University of Thessaloniki, Konstantinoupoleos 49, 54642, Thessaloniki, Greece. psarafidis11@yahoo.gr.