N Koliakos1, D Papaconstantinou2. 1. 3rd Department of Surgery, Medical School, Attikon University Hospital, National and Kapodistrian University of Athens, Rimini Str. 1, 12462, Athens, Greece. 2. 3rd Department of Surgery, Medical School, Attikon University Hospital, National and Kapodistrian University of Athens, Rimini Str. 1, 12462, Athens, Greece. Dimpapa7@hotmail.com.