1. Department of Cardiovascular and Thoracic Surgery, University of Thessaly, Larissa, Greece
2. Department of Medicine, McGill University, Montreal, Canada
3. Vascular Surgery Unit, Thriassio General Hospital, Athens, Greece
4. Department of Cardiac Surgery, Heart and Vessels Clinic Bad Neustadt, Bad Neustadt a.d. Saale, Germany
5. Department of Cardiology, University of Thessaly, Larissa, Greece
6. Department of Physiology, University of Thessaly, Larissa, Greece