1. First Department of Surgery, National and Kapodistrian University of Athens, Laikon General Hospital, Athens, Greece
2. First Department of Pathology, National and Kapodistrian University of Athens, Medical School, Athens, Greece
3. Third Department of Surgery, National and Kapodistrian University of Athens, Attikon University Hospital, Athens, Greece
4. First Propaedeutic Department of Surgery, National and Kapodistrian University of Athens, Hippokration General Hospital, Athens, Greece
5. Second Department of Propaedeutic Surgery, National and Kapodistrian University of Athens, Laikon General Hospital, Athens, Greece
6. Department of Surgery, General Hospital of Ierapetra, Ierapetra, Greece