1. Third Surgical Department, “AHEPA” University Hospital, Medical Faculty, Aristotle University of Thessaloniki, 1 Kiriakidi Street, 54636 Thessaloniki, Greece
2. Second Surgical Department, “G. Gennimatas” University Hospital, Medical Faculty, Aristotle University of Thessaloniki, 41 Eth. Aminis Steet, 54635 Thessaloniki, Greece
3. Biostatistics Unit, Medical Faculty, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
4. Surgical Department, ‘St Luke’s’ Hospital, 55236 Thessaloniki, Greece
5. Radiology Department, “Euromedica” Diagnostic Center, 35 Gr. Lampraki & Ag. Dimitriou Street, 54638 Thessaloniki, Greece
6. Medical Faculty, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
7. Surgical Department, European Interbalkan Medical Center, 10 Asklipiou Street, 55535 Thessaloniki, Greece