Georgia Tsaousi1, Vasilios Grosomanidis1, Katerina Kotzampassi2. 1. Department of Surgery, Faculty of Medicine, Aristotle University Thessaloniki, University Campus, 54006, Thessaloniki, Greece. 2. Department of Surgery, Faculty of Medicine, Aristotle University Thessaloniki, University Campus, 54006, Thessaloniki, Greece. kakothe@yahoo.com.