1 Department of Gastroenterology, General Hospital of Nikea and Piraeus, AgiosPanteleimon, Nikea, Greece.
2 Department of Basic Medical Sciences, Laboratory of Biology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.
3 Academic Department of Gastroenterology, Laiko General Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece.
4 2nd Department of Surgery, Aretaieion University Hospital, National and Kapodistrian University of Athens, Athens, Greece.
5 Department of Basic Medical Sciences, Laboratory of Biology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece. Electronic address: mgazouli@med.uoa.gr.