1. Cardiothoracic Surgery Department, Theagenio Cancer Hospital, Al. Symeonidi 2, 54007 Thessaloniki, Greece
2. Laboratory of Histology and Embryology, Medical School, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece
3. 2nd Propedeutical Department of Surgery, Hippokration General Hospital, Aristotle University of Thessaloniki, Konstantinoupoleos 49, 54642 Thessaloniki, Greece