1 Department of Thoracic and Cardiovascular Surgery, Evangelismos General Hospital, Athens, Greece. Electronic address: prorris@gmail.com.
2 Department of Thoracic and Cardiovascular Surgery, Evangelismos General Hospital, Athens, Greece; Department of Vascular Surgery, "Attikon" University Hospital of Athens, Greece.
3 Department of Thoracic and Cardiovascular Surgery, Evangelismos General Hospital, Athens, Greece.
4 Department of Anesthesiology, Evangelismos General Hospital, Athens, Greece.