1. Surgery Department, 2nd Clinic of Surgery, Aretaieion Hospital, National and Kapodistrian University of Athens, Athens, Attica, Greece
2. Cardiological Department, Aretaieion Hospital, National and Kapodistrian University of Athens, Athens, Attica, Greece
3. 2nd Clinic of Surgery, Aretaieion Hospital, National and Kapodistrian University of Athens, Athens, Attica, Greece