1. First Department of Surgery, National & Kapodistrian University of Athens, Laikon General Hospital, Athens, 11527, Greece
2. Oncology Unit, Second Propaideutic Department of Internal Medicine, National & Kapodistrian University of Athens, Attikon University Hospital, Athens, 12462, Greece
3. Second Propaedeutic Department of Surgery, National & Kapodistrian University of Athens, Laikon General Hospital, Athens, 11527, Greece
4. Department of Surgery, University of Patras, University Hospital of Patras, Rio, 26504, Greece