1. First Department of Surgery, Laikon General Hospital, National and Kapodistrian University of Athens, 115 27 Athens, Greece
2. Laboratory of Biology, Department of Basic Medical Sciences, Medical School, National and Kapodistrian University of Athens, 115 27 Athens, Greece
3. Department of Cardiac Surgery, Onassis Cardiac Surgery Center, 176 71 Athens, Greece
4. First Department of Pathology, Medical School, National and Kapodistrian University of Athens, 115 27 Athens, Greece
5. Gastroenterology Unit, Department of Pathophysiology, School of Medicine, National and Kapodistrian University Athens, 115 27 Athens, Greece