1. Division of Gastroenterology; 2 Propaedeutic Department of Internal Medicine; “Hippokration” General Hospital; Aristotle University of Thessaloniki; Thessaloniki Greece
2. Gastrointestinal Endoscopy Unit; Democritus University of Thrace; University General Hospital of Alexandroupolis; Alexandroupolis Greece
3. Department of Pathology; “Hippokration” General Hospital; Thessaloniki Greece
4. 2 Department of Surgery; Democritus University of Thrace; University General Hospital of Alexandroupolis; Alexandroupolis Greece