Eleftherios Spartalis1,2, Theodore Troupis3. 1. Laboratory of Experimental Surgery and Surgical Research, National and Kapodistrian University of Athens, Medical School, Vasilissis Sofias 49, Kolonaki 106 76, Athens, Greece. eleftherios.spartalis@gmail.com. 2. Department of Anatomy, National and Kapodistrian University of Athens, Athens, Medical School, Vasilissis Sofias 49, Kolonaki 106 76, Athens, Greece. eleftherios.spartalis@gmail.com. 3. Department of Anatomy, National and Kapodistrian University of Athens, Athens, Medical School, Vasilissis Sofias 49, Kolonaki 106 76, Athens, Greece.