1. 3rd Surgical Department, University Hospital of Thessaloniki AHEPA, Aristotle University of Thessaloniki, Thessaloniki, Greece
2. Department of Surgery, Interbalkan European Medical Center, Thessaloniki, Greece
3. Department of Pathology, Faculty of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
4. Department of Pathology, Faculty of Medicine, Aristotle University of Thessaloniki,, Thessaloniki, Greece
5. Department of Oncology, Interbalkan European Medical Center, Thessaloniki, Greece
6. Department of Internal Pathology, University Hospital of Ioannena, Ioannena, Greece
7. Digestive System Endoscopy Unit, Democritus University of Thrace, Alexandroupoli, Greece