1. 2nd Department of Surgery, Democritus University of Thrace, University General Hospital of Alexandroupolis, 68100 Dragana, Alexandroupolis, Greece
2. Gastrointestinal Endoscopy Unit, Democritus University of Thrace, University General Hospital of Alexandroupolis, 68100 Dragana, Alexandroupolis, Greece
3. Department of Radiology, Democritus University of Thrace, University General Hospital of Alexandroupolis, 68100 Dragana, Alexandroupolis, Greece