1. Molecular Oncology Unit, Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, Athens, Greece
2. Department of Gastroenterology, General Hospital of Athens “Laiko” Medical School of National and Kapodistrian University of Athens, Athens, Greece
3. Department of Pathophysiology, “Laikon” General Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
4. First Department of Pathology, Medical School, National and Kapodistrian University of Athens, Athens, Greece
5. First Department of Surgery, Laiko Hospital, National and Kapodistrian University of Athens, Medical School, Athens, Greece