1. 1st Department of Surgery, General Hospital of Kavala, Agios Silas, 65500 Kavala, Greece
2. 1st Department of Urology, G. Gennimatas General Hospital, Aristotle University of Thessaloniki, 41 Ethnikis Amynis Street, 54635 Thessaloniki, Greece
3. 1st Department of Surgery, Theagenio Cancer Hospital of Thessaloniki, Alexandrou Simeonidi 2, 54007 Thessaloniki, Greece
4. 1st Department of Respiratory Medicine, General Hospital of Kavala, Agios Silas, 65500 Kavala, Greece