1. Laboratory of Pharmacology, Faculty of Medicine, Alexandroupolis, Greece
2. Laboratory of Gastroenterology, University of Crete, Heraklion, Greece
3. 2nd Department of Internal Medicine of University Hospital of Alexandroupolis, Alexandroupolis, Greece
4. 1st Department of Internal Medicine of University Hospital of Alexandroupolis, Democritus University of Thrace, Alexandroupolis, Greece
5. GI Unit, 3rd Academic Department of Internal Medicine, National and Kapodistrian University of Athens, Sotiria Hospital, Athens, Greece